Babypercentiles plots growth without pretending to be a pediatrician

Field notes

The calculator accepts ages in months or a date of birth plus measurement date, then converts units at the edges while performing the mathematics in metric. It draws from five WHO and CDC agency tables, including separate weight, length or stature, and head-circumference datasets. The page deliberately marks the visible seam between WHO standards through 24 months and CDC reference charts thereafter rather than smoothing the transition.