WHO growth charts and milestones, made calmer
Track weight, height, head circumference and milestones together, so you can follow the trend instead of worrying about one measurement.
Sunny Seed plots weight, height and head circumference on the official WHO growth charts and shows the percentile that matters — the same LMS reference standard pediatricians use. Instead of worrying about a single number, you follow the curve over time and see clear, color-coded zones at a glance.
Percentiles and z-scores are calculated on your device from the built-in WHO tables, so growth tracking works completely offline and your measurements stay private. Premature babies are supported with corrected age until 2–3 years, and developmental milestones by age sit right alongside the charts.
WHO percentiles
Instant percentile calculation using WHO standards — based on WHO standards used in pediatric growth assessment. P3–P97 is the standard reference range.
Color-coded zones
Green (within the reference range), dark green (near the median), red (worth discussing with your doctor). Clear at a glance.
Premature baby support
Enter gestational age at birth — charts automatically use corrected age until 2–3 years old.
Milestones by age
Track developmental milestones — motor skills, speech and social — alongside growth, based on WHO reference ages.
No internet required
All WHO data is stored locally on your device. Percentile calculation works completely offline.
Enter a measurement
Weight, height, or head circumference — measured at home or taken from a doctor visit.
Instant percentile
Calculation happens on-device using WHO LMS tables. No waiting, no network call.
Track the curve
Each measurement adds a point to the chart. The trend matters more than any single number.
Frequently asked questions
Which growth standard does Sunny Seed use?
The official WHO Child Growth Standards (LMS method) — the same reference pediatricians use for weight-for-age, height-for-age and head circumference from 0 to 5 years.
Are percentiles calculated online?
No. All WHO tables are bundled in the app and percentiles are computed on your device, so it works fully offline and your measurements stay on your phone.
Does it work for premature babies?
Yes. Enter the gestational age at birth and Sunny Seed uses corrected age for growth until 2–3 years, so premature babies are assessed fairly.
What can I track?
Weight, height and head circumference — each with its WHO percentile and z-score — plus developmental milestones by age.
Follow your baby’s growth with more context.
Available on iOS and Android