Free Baby Growth Simulator
Baby Growth Simulator helps you enter birth date, record date, sex, length, weight, head circumference, and gestational age, then estimate WHO 0-24 month percentiles and z-scores. Save repeated local records to see whether growth trends look steady over time.
Private in your browser, with local records and calm reminders to ask a doctor about unexpected patterns.
Start Baby Growth Simulator here: calculate exact age, use corrected age for premature babies, review percentile plus z-score, save records locally, and print a concise summary for a pediatric visit.
Enter birth date and measurement date for exact age. Add gestational age if baby was born early; Baby Growth Simulator uses corrected age for the curve when gestation is under 40 weeks.
Share the Baby Growth Simulator page. Baby measurements stay local unless you choose to copy a text summary.
For children under 2 years, measure recumbent length on a firm flat surface with the head against a fixed board and legs gently straight. Use the same method each time; standing height is usually for older children.
Wrap a non-stretch tape around the largest head circumference, usually above the eyebrows and ears and around the back of the head. Recheck if hair, tape angle, or movement may have changed the number.
This tool uses WHO Child Growth Standards for 0-24 months and LMS z-score math for length-for-age, weight-for-age, and head-circumference-for-age. CDC recommends WHO standards for U.S. children from birth to 2 years.
Latest Baby Growth Simulator estimate
Height percentile
Weight percentile
Head percentile
Saved records show whether height and weight move smoothly over age.
The last two records estimate recent growth speed and percentile-band movement.
Records stay in this browser and can be cleared any time.
| Age | Curve age | Height | Weight | Head | Date |
|---|
Growth charts are screening references, not a diagnosis. Percentile and z-score results depend on accurate age, corrected age for prematurity, measurement technique, feeding, illness, family pattern, and clinical history. Contact a doctor promptly for poor feeding, dehydration, weight loss, sudden drops, or any concern that feels urgent.
Reference: WHO Child Growth Standards, 0-24 months LMS parameters. Context: CDC growth-chart guidance says growth charts are percentile curves used to monitor children, and they should not be the only diagnostic tool.
Baby Growth Simulator uses WHO Child Growth Standards LMS values for birth to 24 months. It is educational and cannot diagnose growth concerns; ask a pediatric clinician about unexpected results or symptoms.
Baby Growth Simulator turns everyday measurement notes into a calmer view of percentiles, saved records, and height and weight trends.
Baby Growth Simulator starts with age in months, sex, length or height, weight, and head circumference, then estimates each percentile using reference curve math.
Baby Growth Simulator lets you save repeated records locally, draw height and weight trend lines, and notice whether growth speed stays broadly consistent.
Use Baby Growth Simulator as a gentle tracking aid, then bring questions or unusual patterns to a pediatric professional.
Enter birth date and record date so Baby Growth Simulator calculates exact chronological age instead of relying only on a rounded month value.
If the baby was premature, enter gestational age at birth so Baby Growth Simulator can show corrected age and use that age on WHO 0-24 month curves.
Print or save the Baby Growth Simulator summary with percentile and z-score results, then bring unusual patterns to a pediatric professional.
If your baby has symptoms, feeding trouble, dehydration signs, or sudden weight changes, seek medical care instead of relying on Baby Growth Simulator.
Explore more simulatorsBaby Growth Simulator focuses on the practical tracking pieces parents often need: percentiles, records, trends, and gentle context.
Estimate length, weight, and head circumference percentile plus z-score from WHO 0-24 month standards.
Save multiple records locally and compare measurements across age.
View height and weight lines so growth speed is easier to scan.
See calm prompts when a percentile is outside the broad reference band.
Calculate exact age from birth date and record date, with corrected age for prematurity when needed.
Print or save a PDF-style summary to bring to a pediatric clinician.
Baby Growth Simulator is useful when you want a private, simple reference before or between regular pediatric visits.
Collect recent measurements before a well-baby visit and bring questions to the clinician.
VisitsSave home records between checkups and watch whether changes look gradual.
HomeCompare the latest record with previous height and weight entries.
TrendUse unusual percentiles or fast shifts as a gentle reason to ask for professional guidance.
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Answers about Baby Growth Simulator percentiles, growth curves, saved records, and when to ask a doctor.
Baby Growth Simulator uses WHO Child Growth Standards LMS parameters for 0-24 months. It converts length, weight, and head circumference into z-scores, then maps those z-scores to approximate percentiles.
No. Baby Growth Simulator is an educational reference only. CDC notes that growth charts help monitor children but should not be the only diagnostic tool; a pediatric clinician can interpret results with exam findings, birth history, prematurity, feeding, illness, and measurement technique.
Growth is usually interpreted as a pattern over time. Baby Growth Simulator saves records locally so you can see whether height and weight trends are broadly steady instead of focusing on one number.
Ask a doctor about unexpected very low or very high percentiles, fast percentile shifts, weight loss, poor feeding, dehydration signs, developmental concerns, or anything that feels urgent.
Use Baby Growth Simulator to estimate baby growth percentiles from age, sex, height, weight, and head circumference.
Save repeated Baby Growth Simulator records locally to watch height and weight trends, then ask a clinician about any unusual pattern.
Baby Growth Simulator is free, private in your browser, and for reference only.