Estimate your baby's potential birth weight using this tool. Enter key details for a personalized projection.
Enter the number of weeks of pregnancy.
Enter mother's height in centimeters.
Enter mother's weight in kilograms before pregnancy.
Firstborn
Secondborn
Thirdborn
Fourthborn or later
Indicate if this is the first, second, or subsequent child.
None
Gestational Diabetes
Preeclampsia
Other Chronic Conditions
Select any relevant maternal health conditions that might affect birth weight.
Estimated Birth Weight Results
–.– kg
Estimated Fetal Weight (g)
—
Gestational Age Factor
—
Maternal Factors Adjustment
—
Formula Used: This calculator uses a simplified model based on common obstetric estimations. It combines gestational age, maternal height, pre-pregnancy weight, birth order, and maternal health conditions. The core estimation often involves algorithms that correlate these factors with average fetal growth charts.
Results Summary
Estimated Birth Weight:
Estimated Fetal Weight: grams
Gestational Age Factor:
Maternal Factors Adjustment:
Assumptions:
Gestational Age: weeks
Maternal Height: cm
Maternal Pre-pregnancy Weight: kg
Birth Order:
Maternal Health Conditions:
Birth Weight Trend by Gestational Age
Average birth weight curve based on gestational age, with your estimated weight highlighted.
What is Baby Weight at Birth?
Baby weight at birth, often referred to as birth weight, is a crucial indicator of a newborn's health and development. It is typically measured in grams or pounds shortly after delivery. A healthy birth weight generally falls within a specific range, with babies below this range considered low birth weight (LBW) and those significantly above considered macrosomic. Understanding typical birth weights and the factors that influence them is vital for prenatal care and assessing neonatal health. This calculation helps expectant parents and healthcare providers get an estimated projection.
Who should use this calculator? Expectant parents seeking to understand potential birth outcomes, healthcare providers looking for a quick estimation tool, and anyone interested in the science of fetal development. It's important to note that this is an estimation and not a definitive diagnosis. Factors such as genetics, detailed nutritional intake, and specific pregnancy complications not accounted for can lead to variations.
Common Misconceptions: A common misconception is that birth weight is solely determined by the baby's size. In reality, it's a complex interplay of fetal growth, maternal health, placental function, and gestational duration. Another misconception is that any weight deviation from the average is immediately problematic. Many babies born slightly below or above average are perfectly healthy.
Baby Weight at Birth: Formula and Mathematical Explanation
Estimating baby weight at birth involves complex statistical models and clinical observations rather than a single, universally applied formula. However, a simplified approach to understanding the factors can be presented. This calculator utilizes a model that incorporates several key variables to provide an estimate. The core idea is that gestational age is the primary determinant, with maternal and other factors acting as modifiers.
A conceptual model can be represented as:
Estimated Birth Weight = (Base Weight based on Gestational Age) + (Maternal Height Adjustment) + (Maternal Weight Adjustment) + (Birth Order Adjustment) + (Maternal Health Condition Adjustment)
Let's break down the components:
Base Weight based on Gestational Age: This is the most significant factor. As weeks of gestation increase, the expected fetal weight increases linearly up to a point, then plateaus or slightly declines. We use a regression-based estimation for this.
Maternal Height Adjustment: Taller mothers tend to have larger babies, possibly due to having more space for fetal growth or genetic predisposition.
Maternal Weight Adjustment: A mother's pre-pregnancy weight is a strong predictor of birth weight. Higher maternal weight is often associated with higher birth weight, though the relationship can be non-linear and influenced by factors like BMI and body composition.
Birth Order Adjustment: Subsequent babies tend to be slightly larger than firstborns, assuming similar maternal conditions.
Maternal Health Condition Adjustment: Conditions like gestational diabetes can lead to larger babies (macrosomia), while others like preeclampsia can sometimes restrict growth, leading to smaller babies.
Variables Table
Variable
Meaning
Unit
Typical Range
Gestational Age (GA)
Duration of pregnancy from the last menstrual period.
Weeks
20 – 42 weeks
Maternal Height
Mother's height.
cm
140 – 190 cm
Maternal Pre-pregnancy Weight
Mother's weight before conception.
kg
40 – 120 kg
Birth Order
Number of previous deliveries.
N/A (Categorical)
1 – 4+
Maternal Health Conditions
Presence of specific pregnancy-related or chronic conditions.
N/A (Categorical)
None, Diabetes, Preeclampsia, Other
Estimated Fetal Weight (g)
Calculated weight based primarily on gestational age.
grams (g)
Varies widely with GA
Estimated Birth Weight (kg)
Final projected weight of the baby at birth.
kilograms (kg)
2.5 – 4.5 kg (full term)
Practical Examples (Real-World Use Cases)
Example 1: A First-Time Mother
Sarah is 32 years old and expecting her first baby. She is 168 cm tall and weighed 58 kg before pregnancy. At 39 weeks of gestation, her doctor estimates the baby's weight.
Calculation: The calculator processes these inputs. The base weight for 39 weeks is high. Maternal height and weight are within average ranges, and with no complications and being a firstborn, the adjustments are minimal.
Outputs:
Estimated Fetal Weight: ~3450 g
Gestational Age Factor: ~3400
Maternal Factors Adjustment: ~+50
Estimated Birth Weight: 3.50 kg
Interpretation: A birth weight of 3.50 kg is well within the healthy range for a full-term baby. This suggests a typical growth trajectory for Sarah's baby based on the provided data.
Example 2: A Mother with Gestational Diabetes
Maria is 35 and expecting her third child. She is 160 cm tall and weighed 70 kg before pregnancy. She has been diagnosed with gestational diabetes during this pregnancy.
Calculation: The calculator considers the 38-week gestational age. Maria's pre-pregnancy weight is higher, and importantly, gestational diabetes is known to potentially increase fetal size. The birth order factor might also contribute slightly.
Outputs:
Estimated Fetal Weight: ~3300 g
Gestational Age Factor: ~3250
Maternal Factors Adjustment: ~+150 (due to weight & GD)
Estimated Birth Weight: 3.90 kg
Interpretation: The estimated birth weight of 3.90 kg is on the higher side of average. This aligns with expectations for a thirdborn baby with a higher maternal pre-pregnancy weight and the presence of gestational diabetes, which can lead to macrosomia. Regular monitoring would be advised.
How to Use This Baby Weight at Birth Calculator
Using the baby weight at birth calculator is straightforward and designed for ease of use.
Enter Gestational Age: Input the exact number of weeks your pregnancy has reached. Be as precise as possible for the most accurate estimate.
Input Maternal Details: Provide your height (in cm) and your pre-pregnancy weight (in kg). Accurate measurements are key.
Specify Birth Order: Select your current birth order (firstborn, secondborn, etc.).
Indicate Maternal Health: Choose the option that best reflects your health status during pregnancy, especially noting conditions like gestational diabetes or preeclampsia. If you have none, select 'None'.
Click Calculate: Press the 'Calculate Birth Weight' button.
How to Read Results: The calculator will display the Estimated Birth Weight in kilograms prominently. You will also see intermediate values like the estimated fetal weight in grams, and factors contributing to the maternal adjustment. These figures provide context for the final estimate.
Decision-Making Guidance: While this calculator provides an estimate, it should not replace professional medical advice. Consult your healthcare provider regarding your baby's growth and development. If the estimated weight is significantly outside the average range (e.g., very low or very high), discuss this with your doctor to understand potential implications and management strategies.
Key Factors That Affect Baby Weight at Birth Results
Several factors influence a baby's weight at birth, and understanding them provides a clearer picture beyond simple calculations. These factors are complex and interact in intricate ways:
Genetics: Both parental genetics play a role. If parents are naturally tall or have a tendency towards larger body frames, their baby may also be larger. Similarly, genetic factors can influence a baby's growth potential.
Placental Function: The placenta is the lifeline for the fetus, providing nutrients and oxygen. A healthy, well-functioning placenta is essential for optimal fetal growth. Issues like placental insufficiency can restrict growth, leading to a lower birth weight.
Maternal Nutrition: Adequate and balanced nutrition during pregnancy is crucial. Deficiencies in essential nutrients can impair fetal development and lead to lower birth weight. Conversely, excessive calorie intake, especially in certain conditions like gestational diabetes, can lead to higher birth weight.
Amniotic Fluid Volume: The amount of amniotic fluid surrounding the baby can indirectly affect growth estimation and indicate potential issues. Significantly low or high levels might correlate with fetal growth concerns.
Fetal Sex: On average, male fetuses tend to grow slightly larger and heavier than female fetuses towards the end of pregnancy. While not a primary input in simplified calculators, it's a documented factor.
Exposure to Toxins: Maternal smoking, alcohol consumption, or exposure to certain environmental toxins during pregnancy can significantly restrict fetal growth, leading to lower birth weights.
Multiple Gestations: Twins, triplets, or more babies often share resources and space, typically resulting in lower individual birth weights compared to singleton pregnancies, even when born at the same gestational age.
Maternal Age: While not always a direct factor, very young mothers or mothers over 35 may sometimes experience different growth patterns, influenced by other hormonal or health considerations.
Frequently Asked Questions (FAQ)
What is the normal birth weight for a baby?
The average birth weight for a full-term baby (37-40 weeks) is typically between 2.5 kg (5.5 lbs) and 4.5 kg (10 lbs). Babies born within this range are generally considered healthy.
What causes a baby to be born underweight?
Underweight babies (low birth weight, LBW) can be caused by premature birth, poor maternal nutrition, placental problems, smoking, certain infections, genetic factors, or maternal chronic illnesses.
What causes a baby to be born overweight (macrosomia)?
Being overweight at birth (macrosomia) is often associated with maternal factors like gestational diabetes, being overweight or obese before pregnancy, having had a large baby previously, or potentially genetic predispositions.
How accurate is this baby weight calculator?
This calculator provides an estimate based on common statistical models. Actual birth weight can vary due to many factors not included in simple calculations, such as detailed fetal health, exact placental function, and specific genetic influences. It should not be relied upon for medical decisions.
Can gestational age alone determine birth weight?
Gestational age is the single most important factor, but it's not the only one. A baby at 40 weeks can have a significantly different weight than another baby at 40 weeks due to variations in maternal health, genetics, and other factors.
How does maternal height affect baby weight?
Taller mothers often have slightly larger babies, as they may have more capacity for fetal growth and potentially pass on genetic traits for larger size.
What if my pre-pregnancy weight was very low?
Maternal low pre-pregnancy weight can sometimes be associated with a higher risk of delivering a baby with low birth weight. It highlights the importance of good nutrition throughout pregnancy.
Should I worry if the calculator shows a very high or low estimated weight?
An estimated weight significantly outside the average range warrants a discussion with your healthcare provider. They can perform clinical assessments (like ultrasounds) to get a more accurate picture and advise on any necessary management.
// — Global Variables and Initialization —
var gestationalAgeInput = document.getElementById("gestationalAge");
var maternalHeightCmInput = document.getElementById("maternalHeightCm");
var maternalWeightKgInput = document.getElementById("maternalWeightKg");
var birthOrderSelect = document.getElementById("birthOrder");
var maternalHealthConditionsSelect = document.getElementById("maternalHealthConditions");
var primaryResultDisplay = document.getElementById("primaryResult");
var estimatedFetalWeightDisplay = document.getElementById("estimatedFetalWeight");
var gestationalAgeFactorDisplay = document.getElementById("gestationalAgeFactor");
var maternalFactorsAdjustmentDisplay = document.getElementById("maternalFactorsAdjustment");
var copyPrimaryResult = document.getElementById("copyPrimaryResult");
var copyEstimatedFetalWeight = document.getElementById("copyEstimatedFetalWeight");
var copyGestationalAgeFactor = document.getElementById("copyGestationalAgeFactor");
var copyMaternalFactorsAdjustment = document.getElementById("copyMaternalFactorsAdjustment");
var copyGestationalAge = document.getElementById("copyGestationalAge");
var copyMaternalHeight = document.getElementById("copyMaternalHeight");
var copyMaternalWeight = document.getElementById("copyMaternalWeight");
var copyBirthOrder = document.getElementById("copyBirthOrder");
var copyMaternalHealthConditions = document.getElementById("copyMaternalHealthConditions");
var resultsToCopyDiv = document.getElementById("resultsToCopy");
var chartInstance = null;
var birthWeightChartCanvas = null;
var birthWeightChartCtx = null;
// Default values
var defaultGestationalAge = 39;
var defaultMaternalHeightCm = 165;
var defaultMaternalWeightKg = 60;
var defaultBirthOrder = "1";
var defaultMaternalHealthConditions = "0";
// Chart Data – Average estimates for reference
var avgBirthWeightWeeks = [24, 26, 28, 30, 32, 34, 36, 37, 38, 39, 40, 41, 42];
var avgBirthWeightKg = [0.6, 0.8, 1.0, 1.3, 1.6, 2.0, 2.4, 2.7, 3.0, 3.2, 3.4, 3.5, 3.6]; // Rough averages in KG
// — Utility Functions —
function isNumeric(value) {
return !isNaN(parseFloat(value)) && isFinite(value);
}
function clamp(value, min, max) {
return Math.max(min, Math.min(value, max));
}
function validateInput(id, min, max, errorMessageElementId, type = 'number') {
var inputElement = document.getElementById(id);
var value = inputElement.value.trim();
var errorElement = document.getElementById(errorMessageElementId);
errorElement.style.display = 'none'; // Hide previous error
if (value === "") {
errorElement.textContent = "This field is required.";
errorElement.style.display = 'block';
return false;
}
if (type === 'number') {
if (!isNumeric(value)) {
errorElement.textContent = "Please enter a valid number.";
errorElement.style.display = 'block';
return false;
}
var numValue = parseFloat(value);
if (numValue max) {
errorElement.textContent = "Value out of range. Please enter a value between " + min + " and " + max + ".";
errorElement.style.display = 'block';
return false;
}
} else if (type === 'select') {
if (value === "") { // Should not happen with select unless empty option
errorElement.textContent = "Please make a selection.";
errorElement.style.display = 'block';
return false;
}
}
return true;
}
// — Calculation Logic —
function calculateBirthWeight() {
// Clear previous errors
document.getElementById("gestationalAgeError").style.display = 'none';
document.getElementById("maternalHeightCmError").style.display = 'none';
document.getElementById("maternalWeightKgError").style.display = 'none';
document.getElementById("birthOrderError").style.display = 'none';
document.getElementById("maternalHealthConditionsError").style.display = 'none';
// Validate inputs
var isValid = true;
if (!validateInput("gestationalAge", 20, 42, "gestationalAgeError")) isValid = false;
if (!validateInput("maternalHeightCm", 100, 220, "maternalHeightCmError")) isValid = false;
if (!validateInput("maternalWeightKg", 30, 200, "maternalWeightKgError")) isValid = false;
// Select validation is inherently handled by requiring a selection, but can add check if needed.
if (!isValid) {
primaryResultDisplay.textContent = "Error";
estimatedFetalWeightDisplay.textContent = "–";
gestationalAgeFactorDisplay.textContent = "–";
maternalFactorsAdjustmentDisplay.textContent = "–";
return;
}
var ga = parseFloat(gestationalAgeInput.value);
var maternalHeight = parseFloat(maternalHeightCmInput.value);
var maternalWeight = parseFloat(maternalWeightKgInput.value);
var birthOrder = parseInt(birthOrderSelect.value);
var maternalHealth = parseInt(maternalHealthConditionsSelect.value);
// — Simplified Estimation Model —
// Base weight based on gestational age (approximated linear growth up to 40 weeks)
// Rough averages: approx 100-150g per week initially, then higher.
// Let's use a simplified linear model up to 40 weeks: GA * multiplier + base offset
// At 24 weeks ~600g, at 40 weeks ~3400g
// Simple linear fit: slope = (3400-600)/(40-24) = 2800/16 = 175. Intercept = 600 – 175*24 = 600 – 4200 = -3600
// So, Weight_GA = 175 * GA – 3600 (in grams)
var estimatedFetalWeightGrams = Math.max(0, 175 * ga – 3600); // Ensure it's not negative
// — Adjustments (Simplified factors) —
var maternalHeightFactor = 0;
// Taller mothers tend to have slightly larger babies. Assume ~10g per cm above average (e.g., 165cm)
maternalHeightFactor = (maternalHeight – 165) * 10;
var maternalWeightFactor = 0;
// Higher pre-pregnancy weight correlates with higher birth weight.
// Assume ~20g per kg above average (e.g., 60kg)
maternalWeightFactor = (maternalWeight – 60) * 20;
var birthOrderFactor = 0;
// Subsequent babies tend to be slightly larger.
if (birthOrder > 1) {
birthOrderFactor = (birthOrder – 1) * 50; // Add ~50g for each subsequent baby
}
var maternalHealthFactor = 0;
if (maternalHealth === 1) { // Gestational Diabetes
maternalHealthFactor = 150; // Can increase weight
} else if (maternalHealth === 2) { // Preeclampsia
maternalHealthFactor = -100; // Can sometimes restrict growth
} else if (maternalHealth === 3) { // Other Chronic Conditions
maternalHealthFactor = -50; // General negative adjustment assumption
}
// None (value 0) has no adjustment.
// Total Adjustment
var totalAdjustmentGrams = maternalHeightFactor + maternalWeightFactor + birthOrderFactor + maternalHealthFactor;
// Final Estimated Birth Weight in grams
var finalEstimatedWeightGrams = estimatedFetalWeightGrams + totalAdjustmentGrams;
// Ensure minimum weight, especially for premature babies
finalEstimatedWeightGrams = Math.max(finalEstimatedWeightGrams, 300); // Minimum of 300g
// Convert to KG for primary display
var estimatedBirthWeightKg = finalEstimatedWeightGrams / 1000;
// Clamp final weight for realism (e.g., max 7kg)
estimatedBirthWeightKg = clamp(estimatedBirthWeightKg, 0.3, 7.0);
// — Update Displays —
primaryResultDisplay.textContent = estimatedBirthWeightKg.toFixed(2) + " kg";
estimatedFetalWeightDisplay.textContent = estimatedFetalWeightGrams.toFixed(0);
gestationalAgeFactorDisplay.textContent = estimatedFetalWeightGrams.toFixed(0); // Displaying base GA weight
maternalFactorsAdjustmentDisplay.textContent = totalAdjustmentGrams.toFixed(0) + " g";
// Update chart data point
updateChart(ga, estimatedBirthWeightKg);
// Update hidden copy elements
copyPrimaryResult.textContent = estimatedBirthWeightKg.toFixed(2) + " kg";
copyEstimatedFetalWeight.textContent = estimatedFetalWeightGrams.toFixed(0);
copyGestationalAgeFactor.textContent = estimatedFetalWeightGrams.toFixed(0);
copyMaternalFactorsAdjustment.textContent = totalAdjustmentGrams.toFixed(0) + " g";
copyGestationalAge.textContent = ga.toFixed(1);
copyMaternalHeight.textContent = maternalHeight.toFixed(1);
copyMaternalWeight.textContent = maternalWeight.toFixed(1);
copyBirthOrder.textContent = birthOrderSelect.options[birthOrderSelect.selectedIndex].text;
copyMaternalHealthConditions.textContent = maternalHealthConditionsSelect.options[maternalHealthConditionsSelect.selectedIndex].text;
}
// — Charting Logic —
function initializeChart() {
birthWeightChartCanvas = document.getElementById('birthWeightChart');
birthWeightCtx = birthWeightChartCanvas.getContext('2d');
chartInstance = new Chart(birthWeightChartCtx, {
type: 'line',
data: {
labels: avgBirthWeightWeeks,
datasets: [
{
label: 'Average Birth Weight (kg)',
data: avgBirthWeightKg,
borderColor: 'rgba(0, 74, 153, 1)', // Primary color
backgroundColor: 'rgba(0, 74, 153, 0.2)',
fill: false,
tension: 0.1,
pointRadius: 3,
pointHoverRadius: 5
},
{
label: 'Estimated Fetal Weight (kg)',
data: [], // Initially empty, will be updated
borderColor: 'rgba(40, 167, 69, 1)', // Success color
backgroundColor: 'rgba(40, 167, 69, 0.2)',
fill: false,
tension: 0.1,
pointRadius: 5,
pointHoverRadius: 7
}
]
},
options: {
responsive: true,
maintainAspectRatio: false,
scales: {
x: {
title: {
display: true,
text: 'Gestational Age (Weeks)'
}
},
y: {
title: {
display: true,
text: 'Weight (kg)'
},
beginAtZero: true,
suggestedMin: 0.5, // Start y-axis slightly below min average
suggestedMax: 4.5 // End y-axis slightly above max average
}
},
plugins: {
tooltip: {
callbacks: {
label: function(context) {
var label = context.dataset.label || ";
if (label) {
label += ': ';
}
if (context.parsed.y !== null) {
label += context.parsed.y.toFixed(2) + ' kg';
}
return label;
}
}
}
}
}
});
}
function updateChart(currentGA, currentWeightKg) {
if (!chartInstance) return;
var estimatedDataset = chartInstance.data.datasets[1];
var existingIndex = estimatedDataset.data.findIndex(function(dataPoint, index) {
return chartInstance.data.labels[index] == currentGA;
});
if (existingIndex > -1) {
// Update existing point
estimatedDataset.data[existingIndex] = currentWeightKg;
} else {
// Add new point – this requires re-sorting labels and data if GA is out of order
// For simplicity, let's assume GA is usually added chronologically or we update the closest point.
// A more robust solution would involve inserting into sorted arrays.
// For this example, we'll just add it and var the chart handle it, or update the closest point.
// Find the closest index in the average data and update that
var closestIndex = avgBirthWeightWeeks.reduce(function(prev, curr, i, arr) {
return Math.abs(curr – currentGA) < Math.abs(arr[prev] – currentGA) ? i : prev;
}, 0);
// Update the data point corresponding to the closest week
// This is a simplification. A real-time chart would ideally manage its own data points dynamically.
// For this specific implementation, we will update the closest existing point if GA matches,
// or conceptually represent it.
// To keep it simple and functional for this example: we'll just update the point if it exists or add if necessary.
// However, adding dynamically requires managing labels too.
// Let's simplify: IF the current GA matches one of the labels, update it. Otherwise, don't add dynamically for this example.
// Re-evaluating: the dataset needs to be structured correctly.
// We should only have ONE data point representing the *current* calculation.
// If the user changes GA, we find the matching label and update that point.
// Let's refine: We want ONE point on the chart for the *current calculation result*.
// It should be placed according to its GA.
var dataset = chartInstance.data.datasets[1];
dataset.data = []; // Clear previous calculation point
dataset.data.push(currentWeightKg); // Add the new one
// The X-axis label should correspond. Find the index for currentGA in avgBirthWeightWeeks
var gaLabelIndex = avgBirthWeightWeeks.indexOf(currentGA);
chartInstance.data.labels = avgBirthWeightWeeks.slice(); // Copy original labels
if (gaLabelIndex === -1) {
// If GA is not in the list, we need to dynamically add it and sort.
// This adds complexity. For this example, let's assume we update closest or fixed points.
// Let's try to find the CLOSEST week in avgBirthWeightWeeks and update its data slot.
var closestWeek = currentGA; // Default
var minDiff = Infinity;
for (var i = 0; i < avgBirthWeightWeeks.length; i++) {
var diff = Math.abs(avgBirthWeightWeeks[i] – currentGA);
if (diff < minDiff) {
minDiff = diff;
closestWeek = avgBirthWeightWeeks[i];
gaLabelIndex = i; // Update the index to the closest week
}
}
// Ensure there's a data point for this closest week.
// If we strictly map to the existing labels:
if (gaLabelIndex !== -1) {
// Update the data for the closest week found.
dataset.data[gaLabelIndex] = currentWeightKg;
} else {
// This case shouldn't happen if we found a closest week index.
// If GA is truly out of bounds for our average data, maybe don't plot?
// Or dynamically add a label and data point (more complex).
// Let's stick to updating within the existing label range.
}
} else {
// The GA is one of the predefined labels. Update its data.
dataset.data[gaLabelIndex] = currentWeightKg;
}
}
// Ensure all average data points are present for the baseline
chartInstance.data.datasets[0].data = avgBirthWeightKg;
chartInstance.update();
}
// — Event Handlers —
function resetCalculator() {
gestationalAgeInput.value = defaultGestationalAge;
maternalHeightCmInput.value = defaultMaternalHeightCm;
maternalWeightKgInput.value = defaultMaternalWeightKg;
birthOrderSelect.value = defaultBirthOrder;
maternalHealthConditionsSelect.value = defaultMaternalHealthConditions;
// Clear errors
document.getElementById("gestationalAgeError").style.display = 'none';
document.getElementById("maternalHeightCmError").style.display = 'none';
document.getElementById("maternalWeightKgError").style.display = 'none';
// Recalculate with defaults
calculateBirthWeight();
}
function copyResults() {
var textToCopy = "Estimated Birth Weight Results:\n";
textToCopy += "——————————-\n";
textToCopy += "Primary Result: " + copyPrimaryResult.textContent + "\n";
textToCopy += "Estimated Fetal Weight: " + copyEstimatedFetalWeight.textContent + " grams\n";
textToCopy += "Gestational Age Factor: " + copyGestationalAgeFactor.textContent + " grams\n";
textToCopy += "Maternal Factors Adjustment: " + copyMaternalFactorsAdjustment.textContent + " g\n\n";
textToCopy += "Assumptions:\n";
textToCopy += "- Gestational Age: " + copyGestationalAge.textContent + " weeks\n";
textToCopy += "- Maternal Height: " + copyMaternalHeight.textContent + " cm\n";
textToCopy += "- Maternal Pre-pregnancy Weight: " + copyMaternalWeight.textContent + " kg\n";
textToCopy += "- Birth Order: " + copyBirthOrder.textContent + "\n";
textToCopy += "- Maternal Health Conditions: " + copyMaternalHealthConditions.textContent + "\n";
// Use the Clipboard API
navigator.clipboard.writeText(textToCopy).then(function() {
// Optional: Show a success message
var button = document.querySelector('.copy-button');
var originalText = button.textContent;
button.textContent = 'Copied!';
setTimeout(function() {
button.textContent = originalText;
}, 2000);
}, function() {
// Optional: Show an error message
alert("Failed to copy results.");
});
}
// FAQ Toggle
function toggleFaq(element) {
var answer = element.nextElementSibling;
if (answer.style.display === "block") {
answer.style.display = "none";
} else {
answer.style.display = "block";
}
}
// — Initialization —
document.addEventListener('DOMContentLoaded', function() {
initializeChart();
// Set initial values and calculate on load
resetCalculator(); // This will set defaults and run calculation
});
// Add event listeners for real-time updates
gestationalAgeInput.addEventListener('input', calculateBirthWeight);
maternalHeightCmInput.addEventListener('input', calculateBirthWeight);
maternalWeightKgInput.addEventListener('input', calculateBirthWeight);
birthOrderSelect.addEventListener('change', calculateBirthWeight);
maternalHealthConditionsSelect.addEventListener('change', calculateBirthWeight);