Formula Used:
1. BMI = (Current Weight in lbs / (Height in inches)^2) * 703
2. Weight Gain = Current Weight – Pre-Pregnancy Weight
3. Recommended Gain at 26 Weeks is based on pre-pregnancy BMI categories and general guidelines.
*Note: These are general guidelines. Consult your healthcare provider for personalized advice.
Pregnancy Weight Gain Trend
Chart shows estimated recommended weight gain based on typical BMI categories up to 26 weeks.
What is 26 Weeks Pregnant Weight Gain?
At 26 weeks pregnant, understanding your weight gain is crucial for monitoring both your health and your baby's development. This stage marks the end of the second trimester for many, a period where fetal growth accelerates significantly. The 26 weeks pregnant weight gain calculator helps you assess if your current weight gain aligns with recommended guidelines based on your pre-pregnancy Body Mass Index (BMI). It's not just about the number on the scale; it's about ensuring adequate nutrition and monitoring for potential complications like gestational diabetes or excessive weight gain, which can lead to issues like preeclampsia or a larger baby.
Who should use it? Any expectant mother who is approximately 26 weeks pregnant and wants to track her weight gain progress against general health recommendations. It's a useful tool for self-monitoring between prenatal appointments.
Common misconceptions:
"I need to eat for two." While nutritional needs increase, it doesn't mean doubling your intake. The focus is on nutrient-dense foods.
"More weight gain means a healthier baby." Excessive weight gain can pose risks. Healthy weight gain supports healthy fetal development without undue maternal stress.
"All weight gain is normal." Significant deviations, either too little or too much, warrant discussion with a healthcare provider.
This calculator provides a snapshot, but individual needs vary. For personalized advice, always consult with your obstetrician or midwife regarding your specific 26 weeks pregnant weight gain.
26 Weeks Pregnant Weight Gain: Formula and Mathematical Explanation
The assessment of 26 weeks pregnant weight gain primarily involves comparing your current weight gain to expected ranges, which are determined by your pre-pregnancy BMI. While a specific formula for "weight gain at 26 weeks" doesn't exist in isolation, we use established metrics:
1. Pre-Pregnancy BMI Calculation
This is the foundational step, as recommended weight gain varies based on your BMI category before conception.
Formula: BMI = (Weight in lbs / (Height in inches)^2) * 703
2. Total Weight Gained Calculation
This measures the actual amount of weight you have gained since before pregnancy.
Formula: Total Weight Gained = Current Weight (lbs) – Pre-Pregnancy Weight (lbs)
3. Recommended Weight Gain Range at 26 Weeks
This is not a direct calculation from input variables but a reference point based on established guidelines from organizations like the Institute of Medicine (IOM).
General Guidelines (Total Recommended Gain by End of Pregnancy):
Underweight (BMI < 18.5): 28-40 lbs
Normal Weight (BMI 18.5-24.9): 25-35 lbs
Overweight (BMI 25-29.9): 15-25 lbs
Obese (BMI >= 30): 11-20 lbs
At 26 weeks (roughly two-thirds of the way through pregnancy), the distribution of this recommended gain is often approximated. For example, a woman with a normal BMI might aim for around 15-20 lbs by this stage, while those in other categories would have different targets. Our calculator provides a typical range for 26 weeks based on these common BMI categories.
Variables Table
Variable
Meaning
Unit
Typical Range
Pre-Pregnancy Weight
Weight before conception
Pounds (lbs)
90 – 300+ lbs
Current Weight
Weight at 26 weeks pregnant
Pounds (lbs)
100 – 350+ lbs
Height
Maternal height
Inches (in)
60 – 76 inches (5'0″ – 6'4″)
Gestational Age
Weeks of pregnancy
Weeks
26 weeks (for this calculator)
Pre-Pregnancy BMI
Body Mass Index before pregnancy
kg/m²
= 30 (Obese)
Total Weight Gained
Difference between current and pre-pregnancy weight
Pounds (lbs)
Varies greatly
Recommended Gain
Target weight gain range for the entire pregnancy
Pounds (lbs)
11-40 lbs (depending on BMI)
The 26 weeks pregnant weight gain calculator uses these principles to give you an estimated safe range.
Practical Examples of 26 Weeks Pregnant Weight Gain
Let's look at how the 26 weeks pregnant weight gain calculator works with real-world scenarios.
Example 1: Normal Pre-Pregnancy BMI
Scenario: Sarah had a normal BMI before getting pregnant. She is now 26 weeks pregnant and wants to check her weight gain.
Pre-Pregnancy Weight: 135 lbs
Current Weight: 158 lbs
Height: 5'5″ (65 inches)
Gestational Age: 26 weeks
Calculator Output:
Pre-Pregnancy BMI Category: Normal Weight (18.5-24.9)
Total Weight Gained: 23 lbs
Recommended Range at 26 Weeks: 15-20 lbs
Primary Result: Slightly Above Recommended Range
Interpretation: Sarah has gained 23 lbs by 26 weeks. Based on her normal pre-pregnancy BMI, the recommended gain is typically 25-35 lbs for the full pregnancy, meaning she should ideally be around 15-20 lbs gained by 26 weeks. While not drastically over, her gain is slightly higher than the typical rate for this stage. She should discuss this with her doctor, focusing on maintaining a healthy diet and moderate exercise.
Example 2: Overweight Pre-Pregnancy BMI
Scenario: Maria was considered overweight before pregnancy. She is now 26 weeks pregnant and tracking her progress.
Pre-Pregnancy Weight: 170 lbs
Current Weight: 185 lbs
Height: 5'8″ (68 inches)
Gestational Age: 26 weeks
Calculator Output:
Pre-Pregnancy BMI Category: Overweight (25-29.9)
Total Weight Gained: 15 lbs
Recommended Range at 26 Weeks: 10-15 lbs
Primary Result: Within Recommended Range
Interpretation: Maria has gained 15 lbs by 26 weeks. For individuals who are overweight pre-pregnancy, the recommended total weight gain is generally lower (15-25 lbs). By 26 weeks, a gain of around 10-15 lbs is often advised. Maria's gain is right within this target range, indicating a healthy progression. She should continue to focus on balanced nutrition and staying active as advised by her healthcare provider.
These examples highlight how the 26 weeks pregnant weight gain calculator provides personalized context based on individual starting points.
How to Use This 26 Weeks Pregnant Weight Gain Calculator
Using the 26 weeks pregnant weight gain calculator is straightforward and provides valuable insights into your pregnancy journey.
Step-by-Step Instructions:
Enter Pre-Pregnancy Weight: Input the weight in pounds (lbs) you were at before you became pregnant. Accuracy here is key.
Enter Current Weight: Input your current weight in pounds (lbs) today. Weigh yourself at the same time of day (preferably morning, before eating) for consistency.
Select Height: Choose your exact height from the dropdown menu (in feet and inches). This is crucial for calculating your pre-pregnancy BMI.
Verify Gestational Age: The calculator defaults to 26 weeks. If you are using it at a different stage, you can adjust this, but for the specific purpose of a '26 weeks pregnant weight gain' assessment, keeping it at 26 is standard.
Calculate: Click the "Calculate Weight Gain" button.
How to Read Results:
The calculator will display:
Main Result: A clear statement indicating whether your current weight gain is within, below, or above the recommended range for 26 weeks pregnant, considering your BMI.
Total Weight Gained: The actual number of pounds you've gained.
Recommended Range at 26 Weeks: The estimated target weight gain range for this specific stage, tailored to your pre-pregnancy BMI.
BMI Category (Pre-Pregnancy): Your classification (Underweight, Normal, Overweight, Obese) based on your starting weight and height.
Chart: A visual representation of your potential weight gain trajectory against recommended guidelines.
Decision-Making Guidance:
The results are a guide, not a diagnosis. Use them to inform conversations with your healthcare provider:
Within Range: Congratulations! Continue your healthy habits and discuss your progress at your next prenatal visit.
Above Range: Discuss potential dietary adjustments or increased safe physical activity with your doctor. Avoid restrictive dieting.
Below Range: Talk to your provider about ensuring you're getting enough calories and nutrients to support your baby's growth.
The "Copy Results" button allows you to easily share this information, while the "Reset" button lets you quickly start over with new inputs. Remember, this 26 weeks pregnant weight gain calculator is a tool to empower you with information for healthier pregnancy discussions.
Key Factors Affecting 26 Weeks Pregnant Weight Gain
While our 26 weeks pregnant weight gain calculator provides a baseline, numerous factors influence individual weight gain during pregnancy. Understanding these can provide a more complete picture:
Pre-Pregnancy BMI: As discussed, this is the primary factor dictating recommended weight gain ranges. Lower starting BMIs require more gain, while higher BMIs require less.
Individual Metabolism: Everyone's body processes food and energy differently. Some individuals naturally gain weight more easily than others, even with similar diets.
Dietary Intake: The quantity and quality of food consumed are direct drivers of weight gain. Nutrient-dense foods support healthy gain, while excessive intake of high-calorie, low-nutrient foods can lead to unhealthy increases.
Physical Activity Levels: Regular, safe exercise burns calories and helps manage weight gain. Sedentary lifestyles can contribute to faster weight accumulation.
Genetics: Family history and genetic predispositions can play a role in how your body stores fat and responds to pregnancy hormones.
Maternal Age: Metabolism can change with age, potentially influencing weight gain patterns during pregnancy. Older mothers might find weight management requires more conscious effort.
Number of Fetuses: Carrying multiples (twins, triplets, etc.) naturally requires significantly more weight gain than a singleton pregnancy.
Medical Conditions: Underlying health issues like thyroid disorders or conditions like preeclampsia can affect weight. Certain medications may also influence weight.
Fluid Retention: Swelling (edema) is common during pregnancy, especially in later stages, and can contribute to scale weight, though it's not fat mass.
It's essential to view the 26 weeks pregnant weight gain calculator results within the context of these personal biological and lifestyle factors. Always consult your healthcare provider for advice tailored to your unique situation.
Frequently Asked Questions (FAQ)
Q1: Is 26 weeks pregnant too early to worry about weight gain?
A: No, it's never too early to be mindful of healthy pregnancy weight gain. While the focus shifts as pregnancy progresses, establishing good habits early is beneficial. At 26 weeks, you're well into the second half of pregnancy, making tracking important.
Q2: What if my weight gain is significantly higher than the recommended range at 26 weeks?
A: If your weight gain is considerably above the recommended range for your BMI, it's important to discuss this with your healthcare provider. Excessive gain can increase risks like gestational diabetes, preeclampsia, and a larger baby, requiring medical guidance.
Q3: What if my weight gain is below the recommended range at 26 weeks?
A: If you're significantly under the recommended weight gain, consult your doctor. This could indicate inadequate calorie intake, potential nutrient deficiencies, or other underlying issues that need to be addressed to ensure proper fetal growth and maternal health.
Q4: Does the calculator account for water weight?
A: The calculator measures total body weight change. While water retention contributes to this, it's factored into the overall weight gain. Significant fluctuations day-to-day are often due to fluid balance, but the trend over weeks is more indicative.
Q5: How accurate are the recommended weight gain ranges?
A: The recommended ranges are based on large-scale studies and are general guidelines. Individual needs can vary based on metabolism, activity level, and other factors. The 26 weeks pregnant weight gain calculator uses these established ranges.
Q6: Should I be concerned if my current weight fluctuates slightly?
A: Minor fluctuations are normal due to hydration, food intake, and bowel movements. Focus on the overall trend of your weight gain over weeks rather than daily changes. Consistent upward or downward trends are more significant.
Q7: Can I use this calculator if I'm having twins?
A: This calculator is designed for singleton pregnancies. Weight gain recommendations differ significantly for multiples. Consult your healthcare provider for specific guidance if you are carrying twins or more.
Q8: How does exercise impact my weight gain calculation at 26 weeks pregnant?
A: Regular, appropriate exercise helps manage weight gain by burning calories and building muscle. While the calculator doesn't directly factor in exercise, maintaining an active lifestyle can help you stay within the recommended weight gain ranges, especially if you're prone to gaining more quickly.
// Function to calculate BMI
function calculateBMI(weightKg, heightM) {
if (weightKg <= 0 || heightM <= 0) return 0;
return weightKg / (heightM * heightM);
}
// Function to get BMI category
function getBMICategory(bmi) {
if (bmi = 18.5 && bmi = 25 && bmi = 30) return "Obese";
return "N/A";
}
// Function to get recommended weight gain range based on BMI and Gestational Age (approximate)
function getRecommendedGainRange(bmiCategory, gestationalAge) {
var totalRecommended;
var lowerBound = 0;
var upperBound = 0;
switch (bmiCategory) {
case "Underweight":
totalRecommended = { min: 28, max: 40 };
break;
case "Normal Weight":
totalRecommended = { min: 25, max: 35 };
break;
case "Overweight":
totalRecommended = { min: 15, max: 25 };
break;
case "Obese":
totalRecommended = { min: 11, max: 20 };
break;
default:
return { min: 0, max: 0, text: "N/A" };
}
// Approximate distribution of total recommended gain by 26 weeks (roughly 2/3rds of the way)
// These are rough estimates and can vary.
var percentageAt26Weeks = 0.66; // Approximately 2/3rds
lowerBound = Math.round(totalRecommended.min * percentageAt26Weeks);
upperBound = Math.round(totalRecommended.max * percentageAt26Weeks);
// Adjustments for very early or late pregnancy stages if needed, but for 26 weeks this is reasonable.
// Ensure bounds make sense, e.g., lower bound shouldn't exceed upper bound.
if (lowerBound > upperBound) {
var temp = lowerBound;
lowerBound = upperBound;
upperBound = temp;
}
// Ensure minimum gains are sensible (e.g., at least a few pounds)
if (lowerBound = 15) lowerBound = 5; // Example minimum for normal/overweight at 26 weeks
if (upperBound = 25) upperBound = 10; // Example minimum for normal/underweight at 26 weeks
return { min: lowerBound, max: upperBound, text: lowerBound + " – " + upperBound + " lbs" };
}
// Function to validate input fields
function validateInput(id, min, max, allowEmpty) {
var input = document.getElementById(id);
var value = parseFloat(input.value);
var errorElement = document.getElementById(id + "Error");
var isValid = true;
errorElement.style.display = 'none'; // Hide previous error
if (isNaN(value)) {
if (!allowEmpty && input.value.trim() === "") {
errorElement.textContent = "This field is required.";
errorElement.style.display = 'block';
isValid = false;
} else if (input.value.trim() !== "") {
errorElement.textContent = "Please enter a valid number.";
errorElement.style.display = 'block';
isValid = false;
}
} else {
if (!allowEmpty && input.value.trim() === "") {
errorElement.textContent = "This field is required.";
errorElement.style.display = 'block';
isValid = false;
} else if (value max) {
errorElement.textContent = "Value is too high.";
errorElement.style.display = 'block';
isValid = false;
}
}
return isValid;
}
// Function to update chart data
function updateChart(prePregnancyWeight, currentWeight, heightInches, gestationalAge) {
var canvas = document.getElementById('weightGainChart');
var ctx = canvas.getContext('2d');
// Clear previous chart
ctx.clearRect(0, 0, canvas.width, canvas.height);
var chartData = {
labels: [], // Weeks
datasets: [
{
label: 'Actual Weight Gain (lbs)',
data: [],
borderColor: '#004a99',
backgroundColor: 'rgba(0, 74, 153, 0.2)',
fill: false,
tension: 0.1
},
{
label: 'Recommended Gain Range (lbs)',
data: [], // This will represent the midpoint of the recommended range
borderColor: '#28a745',
backgroundColor: 'rgba(40, 167, 69, 0.2)',
fill: '-1', // Fill to the previous dataset (actual weight)
tension: 0.1
}
]
};
var prePregnancyBMIValue = calculateBMI(prePregnancyWeight * 0.453592, heightInches * 0.0254); // Convert lbs to kg, inches to meters
var prePregnancyBMICategory = getBMICategory(prePregnancyBMIValue);
var recommendedRange = getRecommendedGainRange(prePregnancyBMICategory, gestationalAge);
// Simulate weeks up to current gestational age, or a reasonable max like 30 weeks for context
var maxWeeksToShow = Math.max(gestationalAge, 30);
for (var week = 1; week <= maxWeeksToShow; week++) {
chartData.labels.push(week + "w");
var recommendedMidpoint = (recommendedRange.min + recommendedRange.max) / 2;
var lowerRecommended = recommendedRange.min;
var upperRecommended = recommendedRange.max;
// Distribute the recommended gain linearly across weeks
var currentRecommendedLower = Math.round((lowerRecommended / 26) * week);
var currentRecommendedUpper = Math.round((upperRecommended / 26) * week);
var currentRecommendedMid = Math.round((recommendedMidpoint / 26) * week);
// Add some basic bounds check for recommended gain
currentRecommendedLower = Math.max(0, currentRecommendedLower);
currentRecommendedUpper = Math.max(currentRecommendedLower, currentRecommendedUpper); // Ensure upper is at least lower
currentRecommendedMid = Math.round((currentRecommendedLower + currentRecommendedUpper) / 2); // Recalculate mid
chartData.datasets[1].data.push(currentRecommendedMid); // Use midpoint for the line graph, fill will handle range
// Calculate actual weight gain points if we have data
if (week 0) {
var simulatedCurrentWeight = prePregnancyWeight + (currentWeight – prePregnancyWeight) * (week / gestationalAge);
chartData.datasets[0].data.push(simulatedCurrentWeight – prePregnancyWeight);
} else {
chartData.datasets[0].data.push(null); // Placeholder if data is not available for this week
}
}
// Modify the fill behavior for the recommended range
// We need two datasets for fillToPrevious, one for lower bound, one for upper bound
// This is a simplification. A true fill between two lines requires more complex SVG or library.
// For native canvas, we can draw a filled polygon or use a different approach.
// Here, we'll adjust the dataset structure to make the 'fill' work conceptually,
// although native canvas fill is tricky with multiple lines and specific ranges.
// A simpler approach for the chart visual:
// Show actual weight gain vs recommended midpoint, and maybe shade the area.
// Or, just show actual gain and the recommended midpoint line.
// Let's try to show Actual Gain and a conceptual "Recommended Range Band"
// For simplicity, we'll use the fill property which expects one dataset defining the area.
// A common approach is to have a dataset for the lower bound and one for the upper bound,
// and then use fill to connect them. This requires careful dataset setup.
// Let's redefine datasets for better fill behavior
chartData.datasets = [
{
label: 'Actual Weight Gain (lbs)',
data: chartData.datasets[0].data,
borderColor: '#004a99',
backgroundColor: 'rgba(0, 74, 153, 0.1)', // Less opaque fill for actual points
fill: false,
tension: 0.1,
pointRadius: 4,
pointHoverRadius: 7
},
{
label: 'Recommended Gain Lower Bound (lbs)',
data: chartData.datasets[1].data.map(function(mid, index) {
var lower = Math.round(mid – (recommendedRange.max – recommendedRange.min) / 4); // Estimate lower bound deviation
return Math.max(0, lower); // Ensure not negative
}),
borderColor: '#28a745', // Green for recommended
backgroundColor: 'rgba(40, 167, 69, 0.3)', // Green fill
fill: false, // This dataset itself doesn't fill initially
tension: 0.1,
borderDash: [5, 5] // Dashed line for lower bound
},
{
label: 'Recommended Gain Upper Bound (lbs)',
data: chartData.datasets[1].data.map(function(mid, index) {
var upper = Math.round(mid + (recommendedRange.max – recommendedRange.min) / 4); // Estimate upper bound deviation
return upper;
}),
borderColor: '#28a745', // Green for recommended
backgroundColor: 'rgba(40, 167, 69, 0.3)', // Green fill
fill: '-1', // Fill area between this dataset and the previous one (lower bound)
tension: 0.1
}
];
// Create the chart
var myChart = new Chart(ctx, {
type: 'line',
data: chartData,
options: {
responsive: true,
maintainAspectRatio: false,
scales: {
x: {
title: {
display: true,
text: 'Gestational Age (Weeks)'
}
},
y: {
title: {
display: true,
text: 'Weight Gain (lbs)'
},
beginAtZero: true
}
},
plugins: {
title: {
display: true,
text: 'Weight Gain Progression',
font: {
size: 16
}
},
tooltip: {
mode: 'index',
intersect: false
}
},
interaction: {
mode: 'nearest',
axis: 'x',
intersect: false
}
}
});
}
// Load Chart.js library dynamically if not already present
function loadChartJs(callback) {
if (typeof Chart === 'undefined') {
var script = document.createElement('script');
script.src = 'https://cdn.jsdelivr.net/npm/chart.js@4.4.0/dist/chart.umd.min.js';
script.onload = function() {
callback();
};
script.onerror = function() {
console.error("Failed to load Chart.js");
};
document.head.appendChild(script);
} else {
callback();
}
}
function calculateWeightGain() {
var prePregnancyWeight = parseFloat(document.getElementById('prePregnancyWeight').value);
var currentWeight = parseFloat(document.getElementById('currentWeight').value);
var heightSelect = document.getElementById('height');
var heightInches = parseInt(heightSelect.value);
var gestationalAge = parseInt(document.getElementById('gestationalAge').value);
// Clear previous errors
document.getElementById('prePregnancyWeightError').style.display = 'none';
document.getElementById('currentWeightError').style.display = 'none';
document.getElementById('heightError').style.display = 'none';
document.getElementById('gestationalAgeError').style.display = 'none';
// Validation
var allValid = true;
allValid = validateInput('prePregnancyWeight', 0) && allValid;
allValid = validateInput('currentWeight', 0) && allValid;
allValid = validateInput('gestationalAge', 1, 42) && allValid; // Gestational age between 1 and 42 weeks
if (currentWeight < prePregnancyWeight) {
document.getElementById('currentWeightError').textContent = "Current weight cannot be less than pre-pregnancy weight.";
document.getElementById('currentWeightError').style.display = 'block';
allValid = false;
}
if (gestationalAge 42) {
document.getElementById('gestationalAgeError').textContent = "Please enter a valid gestational age between 1 and 42 weeks.";
document.getElementById('gestationalAgeError').style.display = 'block';
allValid = false;
}
if (!allValid) {
document.getElementById('results').style.display = 'none';
return;
}
// Calculations
var totalWeightGained = currentWeight – prePregnancyWeight;
// Convert height to inches for consistency if needed elsewhere, but select value is already in inches
// var heightCm = heightInches * 2.54; // Convert inches to cm if needed for other formulas
// var weightKg = prePregnancyWeight * 0.453592; // Convert lbs to kg
var prePregnancyBMIValue = calculateBMI(prePregnancyWeight * 0.453592, heightInches * 0.0254);
var prePregnancyBMICategory = getBMICategory(prePregnancyBMIValue);
var recommendedRange = getRecommendedGainRange(prePregnancyBMICategory, gestationalAge);
var mainResultText = "";
var resultColorClass = "";
var currentGain = totalWeightGained;
var targetLower = recommendedRange.min;
var targetUpper = recommendedRange.max;
if (currentGain targetUpper) {
mainResultText = "Above Recommended Range";
resultColorClass = "alert-danger"; // Custom class for styling
} else {
mainResultText = "Within Recommended Range";
resultColorClass = "alert-success"; // Custom class for styling
}
// Display Results
document.getElementById('mainResult').textContent = mainResultText;
document.getElementById('mainResult').className = 'main-result ' + resultColorClass; // Apply class for styling
document.getElementById('totalWeightGained').textContent = totalWeightGained.toFixed(1) + " lbs";
document.getElementById('recommendedRange').textContent = recommendedRange.text + " (for full pregnancy)";
document.getElementById('bmiCategory').textContent = prePregnancyBMICategory + " (BMI: " + prePregnancyBMIValue.toFixed(1) + ")";
document.getElementById('results').style.display = 'block';
// Update Chart
loadChartJs(function() {
updateChart(prePregnancyWeight, currentWeight, heightInches, gestationalAge);
});
}
function resetForm() {
document.getElementById('prePregnancyWeight').value = ";
document.getElementById('currentWeight').value = ";
document.getElementById('height').value = '80'; // Default to 5'4″
document.getElementById('gestationalAge').value = '26';
document.getElementById('results').style.display = 'none';
// Clear errors
document.getElementById('prePregnancyWeightError').style.display = 'none';
document.getElementById('currentWeightError').style.display = 'none';
document.getElementById('heightError').style.display = 'none';
document.getElementById('gestationalAgeError').style.display = 'none';
}
function copyResults() {
var mainResult = document.getElementById('mainResult').textContent;
var totalWeightGained = document.getElementById('totalWeightGained').textContent;
var recommendedRange = document.getElementById('recommendedRange').textContent;
var bmiCategory = document.getElementById('bmiCategory').textContent;
var copyText = "26 Weeks Pregnant Weight Gain Calculator Results:\n\n";
copyText += "Summary: " + mainResult + "\n";
copyText += "Total Weight Gained: " + totalWeightGained + "\n";
copyText += "Recommended Range (Full Pregnancy): " + recommendedRange + "\n";
copyText += "Pre-Pregnancy BMI Category: " + bmiCategory + "\n\n";
copyText += "Assumptions: Based on entered pre-pregnancy weight, current weight, height, and gestational age.\n";
copyText += "Disclaimer: These are general guidelines. Consult your healthcare provider for personalized advice.";
navigator.clipboard.writeText(copyText).then(function() {
// Optional: Provide user feedback
var btn = document.querySelector('.copy-button');
var originalText = btn.textContent;
btn.textContent = 'Copied!';
setTimeout(function() {
btn.textContent = originalText;
}, 2000);
}).catch(function(err) {
console.error('Failed to copy text: ', err);
// Fallback for browsers that don't support navigator.clipboard
var textArea = document.createElement("textarea");
textArea.value = copyText;
textArea.style.position = "fixed";
textArea.style.left = "-9999px";
document.body.appendChild(textArea);
textArea.focus();
textArea.select();
try {
var successful = document.execCommand('copy');
var msg = successful ? 'Copied!' : 'Copy failed';
var btn = document.querySelector('.copy-button');
var originalText = btn.textContent;
btn.textContent = msg;
setTimeout(function() { btn.textContent = originalText; }, 2000);
} catch (err) {
console.error('Fallback copy failed: ', err);
var btn = document.querySelector('.copy-button');
var originalText = btn.textContent;
btn.textContent = 'Error';
setTimeout(function() { btn.textContent = originalText; }, 2000);
}
document.body.removeChild(textArea);
});
}
// Initial calculation on page load if defaults are set, or just to ensure chart is potentially setup
// You might want to call calculateWeightGain() here if you want it to run with default values.
// For now, we var the user click the button.
// Ensure chart is initialized on load if Chart.js is available
document.addEventListener('DOMContentLoaded', function() {
loadChartJs(function() {
// You can optionally call calculateWeightGain() here if you want the chart to load with default/empty values initially
// Or just ensure the canvas element is ready.
// updateChart(0, 0, 60*12+1, 26); // Example initial call with placeholder data
});
});