EstreluBaby Growth Tracker with WHO Growth Charts
Estrelu is a baby growth tracker that plots your baby's weight and length on WHO growth charts. Each measurement lands on a 2006 WHO standard curve, with a reference band from the 3rd to the 97th percentile and a dashed median line. There are no red alarms or labels. It runs in your browser, works offline, and has no ads.
After the checkup
The nurse reads out a weight and length, and you nod. Later you wonder how that compares to last month, or what the doctor meant by "tracking along nicely." Writing numbers on a paper card doesn't show the shape of the curve. Estrelu puts each measurement on the chart, so you can see the line over time.
How the growth tracker works
- Add a measurement. Enter your baby's weight and length with the date, for example right after a checkup.
- Choose sex if you want. It's optional. The WHO standards have separate charts for boys and girls.
- See the curve. Your baby's points appear on the WHO 2006 curve, with a band from the 3rd to the 97th percentile and a dashed median line.
- Watch the trend. Each new point extends your baby's line, so you see direction over time, not just a single number.
A typical growth app vs Estrelu
| Usually | In Estrelu |
|---|---|
| Red warnings when a point is outside a range | No red colors and no warning labels |
| "Good" or "bad" scores | No grades, just the reference band and median |
| Unclear which charts are used | WHO 2006 Child Growth Standards |
| Sex required to see a chart | Sex is optional |
| Separate from the rest of your log | Growth sits next to feeds, sleep and doctor visits |
What it's based on and what it doesn't do
The curves come from the WHO Child Growth Standards, released in 2006 (WHO). The CDC and the AAP recommend these WHO charts for US babies from birth to 2 years (CDC), and the CDC publishes them for download (CDC). The band shows the 3rd to the 97th percentile, and the dashed line marks the median.
A percentile is a reference point, not a score. Many healthy babies sit near the edges of the band, and a single point says little on its own. That's why Estrelu shows the line without judgment.
Since we follow the trend over a period of time, we don't focus on one single measurement, or data point, but instead the entire collection.
What Estrelu does not do:
- It does not judge growth as normal or abnormal, or diagnose anything.
- It does not replace measurements taken by your pediatrician.
- It does not connect to smart scales.
Bring your chart to the next checkup with the doctor visit summary. Growth is easier to understand next to your feeding log, so you can show how your baby has been eating too.
When to call your pediatrician
Call your baby's doctor if you're worried about weight gain, if your baby is feeding poorly or has fewer wet diapers, or if growth seems to change direction between visits. Your pediatrician looks at growth together with your baby's overall health.
Estrelu is not a medical device. It does not diagnose, calculate doses or replace advice from your doctor.
How to start
- Open Estrelu in your phone browser. You don't need the App Store or Google Play.
- Enter your email and the code we send you. There is no password.
- Add Estrelu to your home screen: on Android tap "Install", on iPhone tap "Share" and "Add to Home Screen".
After the first visit the app works offline.
One subscription per family
The first 5 days are free and we don't ask for a card. After that: $4.99 a month, $44.99 a year (instead of $59.88, 25% off), or $79 once for lifetime. Every plan includes every feature, with any number of adults and up to four babies. Paying in USDT is 10% cheaper.
Your data
Your logs are saved on your phone and synced through our server with the whole family. You can export them to JSON or CSV and delete them in settings. Symptom photos stay on your phone only. Estrelu has no ads and no third-party trackers. Privacy policy
Frequently asked questions
- Which growth charts does Estrelu use?
- The WHO Child Growth Standards from 2006. The CDC also publishes these WHO charts for use in the US.
- What does the shaded band on the chart mean?
- It covers the 3rd to the 97th percentile of the WHO standard. The dashed line is the median. They are reference lines, not a grade.
- Will Estrelu tell me if my baby is too small or too big?
- No. Estrelu shows the measurements on the chart with no good or bad labels and no red colors. Your pediatrician interprets growth.
- Do I have to enter my baby's sex?
- No, it's optional.
- Does the growth tracker work offline?
- Yes. After the first visit, Estrelu works without internet, and new measurements sync with your family once you're back online.
Sources
- WHO Child Growth Standards who.int
- CDC: WHO Growth Charts cdc.gov
- CDC: Summary — Using WHO Child Growth Standards cdc.gov
- Cook Children's Checkup Newsroom: The Growth Chart: How Is Your Child Trending? checkupnewsroom.com
Try Estrelu
Five days free, no card asked.
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