Developer Builds Privacy-First Baby Growth Percentile Calculator Using WHO and CDC Data
A developer has launched a free baby growth percentile calculator at babypercent.com, built using Next.js with no database or user tracking. The tool calculates weight, height, and head circumference percentiles for children aged 0 to 36 months. It draws on WHO Child Growth Standards for ages 0 to 24 months and CDC reference data for ages 24 to 36 months, displaying results on a visual growth chart. The project comprises 35 pre-rendered pages for fast loading. The developer noted that parsing the dense WHO data tables into usable JSON was more time-consuming than building the calculator interface itself.
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