New parents obsess over percentile numbers. I get it. I built a tool that plots your baby measurements against official WHO and CDC growth standards.
What it does:
- Weight, height, and head circumference percentiles for ages 0-36 months
- Visual growth chart showing where your baby falls on the curve
- Uses WHO Child Growth Standards (0-24 months) and CDC reference data (24-36 months)
- 35 pages, all pre-rendered for fast loading
The hard part: Parsing the WHO growth standard tables into usable JSON. Those tables are dense and not designed for programmatic use. That took more time than building the actual calculator UI.
?? Try it: babypercent.com
Built with Next.js, no database, no tracking. Just a calculator that respects your privacy.
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