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Know where your child stands. Bring it to the doctor.

Every measurement plotted on the standard CDC recommends for your child’s age: WHO from birth to 2, CDC from 2 to 20. Corrected age for preemies, milestones explained honestly, and a one-page report for the checkup.

Open the growth chartStart a name room
WHO Child Growth Standards · 0–24 moCDC 2000 growth charts · 2–20 y

Weight-for-age

WHO standard · auto
Example values · type yours
Sex
Weight
kg
46810Birth2 mo4 mo6 mo8 mo10 mo12 mo50th2nd98th10th90th25th75thValues in kg.
25th–75th10th–90th2nd–98thYour entry

About the 46th percentile for weight. Out of 100 girls this age, about 46 weigh less.Age 6 months 2 days. A percentile is a position, not a grade: a healthy child can sit anywhere on the chart. What your pediatrician watches is the trend across visits.

Add another measurementSave to a private recordDoesn’t match your doctor’s number?

Two front doors, one record that belongs to you.

Start with the checkup or start with the name. Both feed the same private child record, which you can share with a partner, grandparents and caregivers, and export whenever you like.

Door 1 · Checkup Ready

Walk into the checkup with the whole story.

  • Every measurement over time, in kg, g, lb + oz, cm or inches
  • CDC milestone checklists, with the 75% context that calms “not yet”
  • Your questions for the doctor, collected between visits, printed on one page
Start with one measurement
Questions to ask1. When should we start solids?
2. Not yet: “Gets to a sitting position by herself”. Anything to try at home?
Checkup report · 6-month visitSample child
4681002468Values in kg.
Weight · 16 Sep 20267.25 kg · 46th
Length · 16 Sep 202665.0 cm · 35th
6-month checklist10 yes · 1 not yet · 1 not sure
Door 2 · Name Match

Find the name you both love.

  • Your partner joins from a link, in any browser, with no app or account
  • A name you’ve rated never comes back
  • Every card carries every US year since 1880, from Social Security data
Open a name room
Hazel
2025 #21
Nora
2025 #202000 #5021950 #225
1880US births per year · SSA2025
You both liked Nora(illustration)
How it fits together

One record, from the name to age 12.

Like the pencil marks on a doorframe, every entry is dated and kept. The record knows which chart applies at each age and which visits include a screening, so you never have to.

Before birth

A shared name room. Lock in the name and it becomes the child’s record on the birth day.

12 checkpoints to age 5

CDC’s milestone ages, each with the screenings AAP recommends at that visit.

The switch at 2 is marked

WHO to CDC, lying length to standing height: drawn on the chart so it never looks like a jump.

Yours to keep

Export everything as CSV or JSON at any time. Pause a profile and every email stops.

The doctor-mismatch decoder

Same baby, same scale, two different percentiles.

Many websites and some older software still plot babies on the CDC 2000 charts, while CDC recommends the WHO standards before age 2. See the same point on both, and why they disagree.

Sample girl, 4.1 months, 6.40 kg: 47th on WHO, 61st on CDC 2000. In the first months WHO’s median weights run heavier than CDC 2000’s, so the same weight lands lower on WHO. From about 7 months the medians cross and the gap reverses.
Both computed from published LMS tables · CDC, retrieved 2026-10-05Sample child
WHO 2006 · 0–247th
468100246850th2nd98th10th90th25th75thValues in kg.
CDC 2000 · older61st
468100246850th3rd97th90th25th75thValues in kg.
Milestones, without the panic

“Not yet” is an answer, not a red flag.

The 2022 CDC and AAP checklists list skills that 75% or more of children show by each age (Zubler et al., Pediatrics, 2022). We keep CDC’s wording exactly, show that context on every item, and turn “not yet” into a clear question for the next visit.

  1. “Not yet” is added to your visit questions. At 9 months AAP recommends a developmental screening, so it is a natural thing to ask about.
  2. If you or the doctor are still concerned, you can ask for a referral to a specialist.
  3. You can also contact your state’s early intervention program yourself. Evaluations are free, and no referral is needed. We show the contact for your state.

CDC: “Learn the Signs. Act Early.” materials “are not a substitute for standardized, validated developmental screening tools.”

What most babies do by 9 monthsSource: CDC Learn the Signs. Act Early.
Example answers · tap to change
“Looks when you call her name”75%+ by 9 mo
“Gets to a sitting position by herself”75%+ by 9 mo
This becomes a visit question. In a saved record, “Not yet” is added to your questions for the next checkup. Most children (75% or more) do this by 9 months, so many are still learning it. Ask about it at the 9-month visit, where AAP recommends a developmental screening. Worried now? You can contact your state’s early intervention program directly.
“Bangs two things together”75%+ by 9 mo

Checklist wording is CDC’s, unchanged. Answers stay in your browser and are not saved.

Every number has a source and a date.

We compute from the original public datasets and say which file, which version and when we fetched it. If a source changes, the page says so.

Growth · 0–24 monthsWHO Child Growth Standards (2006)Weight, length, head circumference and weight-for-length LMS tables, as published by CDC.ftp.cdc.gov · growthcharts · fetched 2026-10-05
Growth · 2–20 yearsCDC 2000 growth chartsStature, weight and BMI-for-age, with CDC’s extended BMI method above the 95th percentile.cdc.gov/growthcharts · fetched 2026-10-05
DevelopmentCDC/AAP milestone checklists (2022)Twelve checkpoints from 2 months to 5 years, quoted with attribution.cdc.gov/act-early · revised 2022
NamesSocial Security card applicationsEvery US name given to five or more babies in a year, 1880 to 2025.ssa.gov · names.zip · data years 1880–2025
SafetyCPSC and NHTSA recallsNursery products, toys and child car seats, synced nightly. Car-seat matches use make and model.saferproducts.gov · nhtsa.gov · nightly
Help near youEarly intervention contactsPart C program contacts for every state and territory, from the ECTA Center directory.ectacenter.org · checked monthly
The childow pledge

A children’s health record has to earn trust in public.

Six promises, published and versioned. If we ever change one, the old version stays visible.

Read the full pledge
  1. 01Core tools are free forever.Growth, milestones, reports, Name Match, recalls and sharing.
  2. 02No ads. No pixels. No data sales.Not on any page, not to any partner.
  3. 03Export everything, any time.CSV and JSON, plus real one-click deletion.
  4. 04No surprise AI on your child’s data.Explanations come from rules you can read.
  5. 05Never a diagnosis.Always the source, and when to talk to your pediatrician.
  6. 06Pause means silence.Pause or close a profile and every email stops at once.