Labrador Puppy Weight Calculator

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Labrador Puppy Weight Calculator

Estimate your Labrador puppy's future adult weight with our intuitive tool.

Labrador Puppy Weight Estimator

Enter your puppy's current weight in pounds (lbs).
Enter your puppy's current age in weeks.
Early (under 6 months) Mid (6-12 months) Late (12+ months) Select the current growth stage of your puppy.

Your Puppy's Estimated Adult Weight

— lbs
Estimated Weeks to Full Growth:
Estimated Adult Weight Range: — – — lbs
Estimated Weight at 6 Months: — lbs
Formula Basis: This calculator uses a common estimation method for Labrador growth, factoring in current weight, age, and general growth phases. Early growth is rapid, slowing down as they approach maturity. This is an estimate and individual dogs can vary.
Labrador Puppy Weight Progression Over Time

Labrador Growth Data Table

Age (Weeks) Typical Weight (lbs) – Female Typical Weight (lbs) – Male
4 5-7 6-8
6 10-14 12-16
8 15-20 18-22
10 20-25 23-28
12 25-30 28-35
16 (4 months) 35-45 40-50
24 (6 months) 45-55 50-65
36 (9 months) 55-65 60-75
48 (12 months) 60-70 65-80
60 (15 months) 65-75 70-85
72+ (18+ months) 65-80 70-90
Typical weight ranges for Labrador Retrievers based on age and sex. Note that individual variations are common.

Labrador Puppy Weight Calculator: Guiding Your Pup's Growth Journey

What is a Labrador Puppy Weight Calculator?

A Labrador puppy weight calculator is an online tool designed to help prospective and current Labrador owners estimate the adult weight of their developing puppy. Based on current weight, age, sex, and breed-specific growth patterns, these calculators provide an educated guess about how large your Labrador will eventually become. Understanding your puppy's potential adult size is crucial for various reasons, including proper nutrition planning, ensuring adequate space, choosing appropriate training equipment, and anticipating potential health concerns related to weight and size.

This tool is particularly useful for new puppy owners who may be unfamiliar with the breed's growth trajectory. It helps manage expectations regarding the size of their furry companion. Common misconceptions include believing that all Labradors reach the maximum end of the breed standard, or conversely, underestimating the significant growth potential of a small puppy. This calculator aims to provide a more nuanced estimate, acknowledging that individual genetics, diet, and health play significant roles. It's a valuable resource for anyone interested in the Labrador puppy weight calculator for predicting their dog's future.

Labrador Puppy Weight Calculator Formula and Mathematical Explanation

The estimation used by this Labrador puppy weight calculator is a simplified model based on observed growth patterns of the breed. While precise scientific formulas can be complex and vary, a common approach involves extrapolating current growth rate and adjusting for the typical slowing of development as a puppy matures. A basic estimation can be conceptualized as:

Estimated Adult Weight = (Current Weight / Current Age in Weeks) * Average Weeks to Adulthood * Growth Factor

However, a more practical approach often used by calculators like this one involves multiplying the weight at a specific milestone (like 6 months) by a factor, or using age-based multipliers that decrease over time. For instance:

  • For puppies under 6 months: Weight at 6 months is often roughly double their weight at 3 months, and adult weight might be around 2 to 2.5 times their weight at 6 months.
  • For puppies over 6 months: Growth slows considerably. Estimations might involve using current weight and a diminishing multiplier based on how close they are perceived to be to full maturity.

The calculator might also internally use data points similar to the provided table, interpolating or extrapolating based on the puppy's current age and weight relative to these benchmarks.

Variables Explanation:

Variable Meaning Unit Typical Range
Current Puppy Weight The puppy's weight at the time of measurement. lbs (pounds) 10 – 50 lbs (depending on age)
Current Age The puppy's age in weeks. Weeks 4 – 52+ weeks
Growth Phase Indicates the general stage of development (early, mid, late). Categorical Early (< 6 mo), Mid (6-12 mo), Late (12+ mo)
Estimated Adult Weight The projected final weight of the Labrador. lbs (pounds) 65 – 90 lbs
Estimated Weight at 6 Months Projected weight around the 6-month mark. lbs (pounds) 45 – 65 lbs
Estimated Weeks to Full Growth Approximate weeks remaining until growth significantly plateaus. Weeks 10 – 50 weeks
Variables used in the Labrador puppy weight estimation.

Practical Examples (Real-World Use Cases)

Example 1: A Young, Rapidly Growing Labrador

Scenario: Sarah has an 8-week-old female Labrador puppy named Daisy. Daisy currently weighs 15 lbs. Sarah wants to know how big Daisy might get.

Inputs:

  • Current Puppy Weight: 15 lbs
  • Current Age (Weeks): 8 weeks
  • Growth Phase: Early

Calculator Output (Illustrative):

  • Estimated Adult Weight: 68 lbs
  • Estimated Weight at 6 Months: 50 lbs
  • Estimated Weeks to Full Growth: 40 weeks

Interpretation: Based on Daisy's current stats, the Labrador puppy weight calculator suggests she is on track to be a medium-to-large sized adult female Lab. Sarah should prepare for a dog in the upper end of the typical range, which means ensuring she has enough food, space, and durable toys for a dog of this size. This estimate helps Sarah plan her puppy's dietary needs to support healthy growth without overfeeding.

Example 2: A Pre-Teen Labrador Approaching Maturity

Scenario: Mark has a 9-month-old male Labrador, Buster, who weighs 70 lbs. Buster seems to still be filling out but not growing as rapidly as before.

Inputs:

  • Current Puppy Weight: 70 lbs
  • Current Age (Weeks): 36 weeks (9 months)
  • Growth Phase: Late

Calculator Output (Illustrative):

  • Estimated Adult Weight: 82 lbs
  • Estimated Weight at 6 Months: 58 lbs (Note: This is a past value, provided for context of growth)
  • Estimated Weeks to Full Growth: 15 weeks

Interpretation: Buster is already a substantial dog but still has some growing to do. The Labrador puppy weight calculator estimates he will reach the higher end of the typical male Labrador weight range. Mark can use this information to adjust Buster's food intake to maintain a healthy weight during this final growth spurt and prevent him from becoming overweight. Knowing his potential adult size also helps Mark consider appropriate exercise routines and potential joint health needs.

How to Use This Labrador Puppy Weight Calculator

Using our Labrador puppy weight calculator is straightforward and designed for ease of use. Follow these simple steps to get an estimate for your growing pup:

  1. Measure Your Puppy: First, accurately weigh your Labrador puppy using a reliable scale. For very young puppies, you might need to weigh yourself, then weigh yourself holding the puppy, and subtract your weight.
  2. Record Current Age: Determine your puppy's exact age in weeks. This is crucial for accurate estimation, as growth rates differ significantly week by week.
  3. Select Growth Phase: Choose the option that best describes your puppy's current stage of development: 'Early' (under 6 months), 'Mid' (6-12 months), or 'Late' (12+ months). This helps the calculator adjust its projection for slowing growth.
  4. Enter Data: Input the puppy's current weight in pounds (lbs) and its current age in weeks into the respective fields. Select the correct growth phase from the dropdown.
  5. View Results: The calculator will automatically update to display the estimated adult weight, the estimated weight at 6 months, and the approximate number of weeks remaining until your puppy reaches its full growth potential. The chart will also update to visualize this growth.
  6. Interpret the Information: Understand that these are *estimates*. Your puppy's actual adult weight can be influenced by genetics, diet, health, and activity level. Use the results as a guide for planning nutrition, training, and healthcare.
  7. Reset or Copy: Use the 'Reset' button to clear fields and start over, perhaps with a different puppy or updated measurements. The 'Copy Results' button allows you to save the displayed estimates and key assumptions for your records.

Reading the results involves looking at the primary estimated adult weight, the range provided, and the projected weight at 6 months. This gives you a picture of both the final size and the developmental milestones. Use this information proactively to ensure your Labrador grows into a healthy, well-proportioned adult dog.

Key Factors That Affect Labrador Growth Results

While our Labrador puppy weight calculator provides a valuable estimate, several factors can cause a puppy's actual growth to deviate from the projected outcome. Understanding these variables is key to ensuring your puppy reaches its optimal adult size and health:

  1. Genetics and Parentage: The most significant factor is genetics. If the puppy's parents are particularly large or small examples of the breed, the puppy is more likely to follow suit. Bloodline and breeder information can offer clues.
  2. Nutrition and Diet Quality: A balanced diet specifically formulated for large-breed puppies is critical. Puppies need the right balance of protein, fats, vitamins, and minerals for steady, healthy bone and muscle development. Overfeeding can lead to rapid, unhealthy growth and potential joint issues, while underfeeding can stunt growth.
  3. Sex of the Puppy: Male Labradors are typically larger and heavier than females. The calculator accounts for general differences, but individual variations exist.
  4. Health and Medical Conditions: Underlying health issues, parasites, or chronic illnesses can impact a puppy's ability to absorb nutrients and grow properly. Regular veterinary check-ups are essential.
  5. Spaying/Neutering Timing: Some research suggests that early spaying or neutering might slightly affect growth plate closure, potentially leading to slightly taller, leaner dogs. While controversial and debated, it's a factor veterinarians consider.
  6. Activity Level and Exercise: While puppies need exercise, excessive high-impact activity before growth plates close can be detrimental. Conversely, very low activity might contribute to obesity later on. A moderate, age-appropriate exercise routine supports healthy development.
  7. Metabolic Rate: Just like humans, puppies have different metabolic rates. Some burn calories faster and may appear leaner, while others convert food to mass more readily.

It's important to consult with your veterinarian. They can assess your puppy's individual growth curve, body condition score, and provide personalized recommendations regarding diet and exercise, ensuring your Labrador reaches a healthy adult weight and size.

Frequently Asked Questions (FAQ)

Q1: How accurate is the Labrador puppy weight calculator?

A: The calculator provides an estimate based on general breed growth patterns. Actual weight can vary significantly due to genetics, diet, health, and individual metabolism. Think of it as a guideline, not a guarantee.

Q2: What is the average adult weight for a male and female Labrador?

A: Generally, adult male Labradors weigh between 65-80 lbs (29-36 kg), and adult females weigh between 55-70 lbs (25-32 kg). However, some can be slightly larger or smaller.

Q3: My puppy is much smaller/larger than the estimate. Should I worry?

A: Not necessarily. If your puppy is eating well, active, and appears healthy, a deviation from the estimate might just mean they are genetically predisposed to be smaller or larger. However, if you have concerns about their size, appetite, or energy levels, consult your veterinarian.

Q4: How often should I weigh my Labrador puppy?

A: For young puppies (under 6 months), weighing them weekly or bi-weekly can help track their rapid growth. As they mature, monthly weigh-ins are usually sufficient until they reach adulthood.

Q5: What kind of food is best for a growing Labrador puppy?

A: Look for a high-quality food specifically formulated for large-breed puppies. These foods have controlled levels of calcium and phosphorus, and appropriate calorie density to support steady growth without causing developmental orthopedic diseases.

Q6: When do Labradors stop growing?

A: Labradors typically reach their full height between 12-18 months of age, but they may continue to fill out and gain muscle mass until they are around 2 years old.

Q7: Does the calculator account for different Labrador coat colors (black, yellow, chocolate)?

A: Coat color does not typically influence a Labrador's adult weight. Growth is primarily determined by genetics, nutrition, and overall health, not color variations within the breed standard.

Q8: Can I use this calculator for other breeds?

A: No, this calculator is specifically designed for Labrador Retrievers, using growth patterns typical for this breed. Other breeds have different growth rates and adult sizes, so a different calculator would be needed.

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errorDisplay.style.display = 'none'; // Hide initially if (isNaN(value) || input.value.trim() === "") { errorDisplay.textContent = fieldName + " is required."; errorDisplay.style.display = 'block'; return false; } if (value maxValue) { errorDisplay.textContent = fieldName + " cannot exceed " + maxValue + "."; errorDisplay.style.display = 'block'; return false; } return true; } function calculateWeight() { // Reset all errors first currentWeightError.style.display = 'none'; currentAgeWeeksError.style.display = 'none'; growthPhaseError.style.display = 'none'; var currentWeight = parseFloat(currentWeightInput.value); var currentAgeWeeks = parseFloat(currentAgeWeeksInput.value); var growthPhase = growthPhaseSelect.value; // Validation var isValid = true; if (!validateInput('currentWeight', 'currentWeightError', 1, 150, 'Current Weight')) isValid = false; if (!validateInput('currentAgeWeeks', 'currentAgeWeeksError', 4, 72, 'Current Age')) isValid = false; // Assuming max age for estimation is around 72 weeks if (!isValid) { primaryResultDiv.textContent = '– lbs'; estimatedWeeksToAdultSpan.textContent = '–'; estimatedAdultWeightRangeSpan.textContent = '– – — lbs'; weightAt6MonthsSpan.textContent = '– lbs'; updateChart([], []); // Clear chart return; } var estimatedAdultWeight; var estimatedWeightAt6Months; var estimatedWeeksToAdult; // Simplified estimation logic var maleMultiplier = 1.15; // Males tend to be larger var femaleMultiplier = 1.0; // Base multiplier for females var adultWeeks = 72; // Approx weeks to maturity for a Lab // Factors based on growth phase and age var ageFactor = 1; var weightFactor = 1; if (growthPhase === 'early') { // Under 6 months (approx < 24 weeks) // Early growth is rapid, higher multiplier for future weight ageFactor = 1.5; // More growth expected weightFactor = 2.1; // Weight at 6 months is roughly 2.1x current weight estimatedWeightAt6Months = currentWeight * weightFactor; estimatedAdultWeight = estimatedWeightAt6Months * 1.3; // Roughly 1.3x weight at 6 months for final adult weight estimatedWeeksToAdult = adultWeeks – currentAgeWeeks; } else if (growthPhase === 'mid') { // 6-12 months (approx 24-48 weeks) // Growth slowing down ageFactor = 1.2; estimatedWeightAt6Months = currentWeight / 0.8; // Back-calculate from current weight, assuming it's past 6 months estimatedAdultWeight = currentWeight * 1.4; // Current weight multiplied by a factor for remaining growth estimatedWeeksToAdult = adultWeeks – currentAgeWeeks; if (estimatedWeeksToAdult 48 weeks) // Growth nearly complete, smaller multiplier ageFactor = 1.05; estimatedWeightAt6Months = currentWeight / (1.4); // Back-calculate estimatedAdultWeight = currentWeight * 1.1; // Very small gain expected estimatedWeeksToAdult = Math.max(5, adultWeeks – currentAgeWeeks); // Minimum few weeks left } // Refine estimations if (growthPhase === 'early') { estimatedWeightAt6Months = currentWeight * (adultWeeks / currentAgeWeeks) * 0.5; // Rough estimation to 6 months estimatedAdultWeight = estimatedWeightAt6Months * 1.4; estimatedWeeksToAdult = adultWeeks – currentAgeWeeks; } else if (growthPhase === 'mid') { estimatedWeightAt6Months = currentWeight * (currentAgeWeeks / (currentAgeWeeks – 12)); // Extrapolate back assuming linear growth till now estimatedAdultWeight = currentWeight * 1.25; // Factor for remaining growth estimatedWeeksToAdult = Math.max(10, adultWeeks – currentAgeWeeks); } else { // Late estimatedWeightAt6Months = currentWeight / 1.5; // Back estimate estimatedAdultWeight = currentWeight * 1.1; // Minimal gain estimatedWeeksToAdult = Math.max(5, adultWeeks – currentAgeWeeks); } // Apply typical weight ranges and sex difference var femaleAdultMin = 55; var femaleAdultMax = 70; var maleAdultMin = 65; var maleAdultMax = 80; var finalAdultMin, finalAdultMax; if (growthPhase === 'early') { estimatedWeightAt6Months = currentWeight * 1.8; // Rough estimate to 6 months estimatedAdultWeight = estimatedWeightAt6Months * 1.4; // Estimate to adult estimatedWeeksToAdult = 72 – currentAgeWeeks; } else if (growthPhase === 'mid') { estimatedWeightAt6Months = currentWeight * (currentAgeWeeks / 28) * 0.9; // More refined to 6 months estimatedAdultWeight = currentWeight * 1.3; // Remaining growth factor estimatedWeeksToAdult = 72 – currentAgeWeeks; } else { // Late estimatedWeightAt6Months = currentWeight / 1.6; // Back estimate estimatedAdultWeight = currentWeight * 1.15; // Very minimal gain estimatedWeeksToAdult = Math.max(8, 72 – currentAgeWeeks); } // Ensure weight at 6 months is plausible relative to adult estimate if (estimatedWeightAt6Months > estimatedAdultWeight * 0.95) { estimatedWeightAt6Months = estimatedAdultWeight * 0.7; } if (estimatedWeightAt6Months < currentWeight * 0.8) { // Should be larger than current if current is very young estimatedWeightAt6Months = currentWeight * 1.5; } // Final refined logic attempt var baseAdultWeightEstimate; var weeksToAdultEstimate = 72 – currentAgeWeeks; if (currentAgeWeeks <= 24) { // Under 6 months (Early) baseAdultWeightEstimate = currentWeight * (72 / currentAgeWeeks) * 0.6; // Projecting based on current rate, adjusted down estimatedWeightAt6Months = currentWeight * 1.7; // Estimate for 6 months weeksToAdultEstimate = 72 – currentAgeWeeks; } else if (currentAgeWeeks <= 48) { // 6-12 months (Mid) baseAdultWeightEstimate = currentWeight * 1.3; // Factor for remaining growth estimatedWeightAt6Months = currentWeight * (currentAgeWeeks / 30); // Back-calc for 6 month weight weeksToAdultEstimate = 72 – currentAgeWeeks; } else { // Over 12 months (Late) baseAdultWeightEstimate = currentWeight * 1.1; // Minimal remaining growth estimatedWeightAt6Months = currentWeight / 1.5; // Back-calc weeksToAdultEstimate = Math.max(8, 72 – currentAgeWeeks); } // Ensure minimum values if (estimatedWeightAt6Months < currentWeight) estimatedWeightAt6Months = currentWeight * 1.2; if (baseAdultWeightEstimate < currentWeight) baseAdultWeightEstimate = currentWeight * 1.2; if (weeksToAdultEstimate finalAdultMax) { var temp = finalAdultMin; finalAdultMin = finalAdultMax; finalAdultMax = temp; } // Ensure plausible weights estimatedWeightAt6Months = Math.max(estimatedWeightAt6Months, currentWeight * 1.3); // Should at least grow estimatedWeightAt6Months = Math.min(estimatedWeightAt6Months, finalAdultMax * 0.8); // Not grow more than adult max by 6 months estimatedAdultWeight = (finalAdultMin + finalAdultMax) / 2; // Use midpoint for primary result primaryResultDiv.textContent = estimatedAdultWeight.toFixed(1) + ' lbs'; estimatedWeeksToAdultSpan.textContent = weeksToAdultEstimate.toFixed(0); estimatedAdultWeightRangeSpan.textContent = finalAdultMin.toFixed(1) + ' – ' + finalAdultMax.toFixed(1) + ' lbs'; weightAt6MonthsSpan.textContent = estimatedWeightAt6Months.toFixed(1) + ' lbs'; updateChart(currentAgeWeeks, baseAdultWeightEstimate); } function updateChart(currentAge, estimatedAdultWeight) { if (!chartCtx) { chartCtx = document.getElementById('weightGrowthChart').getContext('2d'); } var labels = []; var femaleData = []; var maleData = []; var puppyData = []; var femaleAdultMin = 55; var femaleAdultMax = 70; var maleAdultMin = 65; var maleAdultMax = 80; var currentWeight = parseFloat(currentWeightInput.value); var currentAgeWeeks = parseFloat(currentAgeWeeksInput.value); var growthPhase = growthPhaseSelect.value; var estimatedAdultW = parseFloat(estimatedAdultWeight.toFixed(1)); var estimatedAdultMin = parseFloat(estimatedAdultWeightRangeSpan.textContent.split(' – ')[0]); var estimatedAdultMax = parseFloat(estimatedAdultWeightRangeSpan.textContent.split(' – ')[1]); var weeksUntilAdult = parseInt(estimatedWeeksToAdultSpan.textContent); var projectedAdultWeeks = 72; // Target weeks for full growth for (var w = 4; w <= projectedAdultWeeks + 10; w += 4) { // Plot points every 4 weeks up to maturity + a bit labels.push(w + 'w'); // Calculate typical weights based on age, scaled by projected adult size var currentAgeRatio = w / projectedAdultWeeks; var typicalFemaleWeight = femaleAdultMin + (femaleAdultMax – femaleAdultMin) * currentAgeRatio * 1.1; var typicalMaleWeight = maleAdultMin + (maleAdultMax – maleAdultMin) * currentAgeRatio * 1.1; // Ensure weights don't exceed final ranges unnaturally typicalFemaleWeight = Math.min(typicalFemaleWeight, femaleAdultMax); typicalMaleWeight = Math.min(typicalMaleWeight, maleAdultMax); femaleData.push(typicalFemaleWeight.toFixed(1)); maleData.push(typicalMaleWeight.toFixed(1)); if (w === currentAgeWeeks) { puppyData.push(currentWeight.toFixed(1)); } else if (w < currentAgeWeeks) { puppyData.push(null); // No data before current age } else { // Project forward linearly from current estimate var remainingWeeks = weeksUntilAdult; if (remainingWeeks estimatedAdultMax) projectedWeight = estimatedAdultMax; if (projectedWeight < currentWeight) projectedWeight = currentWeight; // Should not decrease puppyData.push(projectedWeight.toFixed(1)); } } if (chart) { chart.destroy(); } chart = new Chart(chartCtx, { type: 'line', data: { labels: labels, datasets: [{ label: 'Typical Female Weight', data: femaleData, borderColor: '#004a99', backgroundColor: 'rgba(0, 74, 153, 0.1)', fill: true, tension: 0.4 }, { label: 'Typical Male Weight', data: maleData, borderColor: '#28a745', backgroundColor: 'rgba(40, 167, 69, 0.1)', fill: true, tension: 0.4 }, { label: 'Your Puppy\'s Projection', data: puppyData, borderColor: '#ffc107', backgroundColor: 'rgba(255, 193, 7, 0.2)', fill: true, tension: 0.4, pointRadius: 5, pointHoverRadius: 7 }] }, options: { responsive: true, maintainAspectRatio: false, scales: { y: { beginAtZero: true, title: { display: true, text: 'Weight (lbs)' } }, x: { title: { display: true, text: 'Age (Weeks)' } } }, plugins: { legend: { position: 'top', }, title: { display: true, text: 'Labrador Puppy Weight Growth Projection' } } } }); } function copyResults() { var resultText = "Labrador Puppy Weight Estimate:\n\n"; resultText += "Estimated Adult Weight: " + primaryResultDiv.textContent + "\n"; resultText += "Estimated Adult Weight Range: " + estimatedAdultWeightRangeSpan.textContent + "\n"; resultText += "Estimated Weight at 6 Months: " + weightAt6MonthsSpan.textContent + "\n"; resultText += "Estimated Weeks to Full Growth: " + estimatedWeeksToAdultSpan.textContent + " weeks\n\n"; resultText += "Key Assumptions:\n"; resultText += "- Based on current weight and age.\n"; resultText += "- Assumes typical Labrador growth patterns.\n"; resultText += "- Individual results may vary.\n"; try { navigator.clipboard.writeText(resultText).then(function() { // Show temporary success message var tempSuccessMsg = document.createElement('div'); tempSuccessMsg.textContent = 'Results copied to clipboard!'; tempSuccessMsg.style.cssText = 'position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%); background-color: var(–success-color); color: white; padding: 15px; border-radius: 5px; z-index: 1000; font-size: 1.2em;'; document.body.appendChild(tempSuccessMsg); setTimeout(function() { document.body.removeChild(tempSuccessMsg); }, 2000); }).catch(function(err) { console.error('Failed to copy: ', err); alert('Failed to copy results. Please copy manually.'); }); } catch (e) { console.error('Clipboard API not available: ', e); alert('Clipboard API not available. Please copy the results manually from the page.'); } } function resetCalculator() { currentWeightInput.value = '15'; // Default to a common starting weight for young pups currentAgeWeeksInput.value = '8'; // Default to a common age growthPhaseSelect.value = 'early'; // Default to early phase // Reset errors currentWeightError.style.display = 'none'; currentAgeWeeksError.style.display = 'none'; growthPhaseError.style.display = 'none'; calculateWeight(); // Recalculate with defaults } // Initial calculation on page load window.onload = function() { if (typeof Chart === 'undefined') { console.error("Chart.js library is not loaded. Please include it."); // Optionally, display a message to the user or handle this gracefully. } else { calculateWeight(); } }; // Add event listener for Chart.js if loaded externally // If Chart.js is included via CDN, this might not be needed, but it's good practice. // For this self-contained HTML, we assume Chart.js is available globally. // If Chart.js were loaded asynchronously, we'd need a callback. // Call calculateWeight whenever inputs change currentWeightInput.addEventListener('input', calculateWeight); currentAgeWeeksInput.addEventListener('input', calculateWeight); growthPhaseSelect.addEventListener('change', calculateWeight); <!– If not available globally, you would need to add: –>

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