I built a free baby growth percentile calculator ? feedback welcome

I built BabyPercent, a free browser-based baby growth percentile calculator for parents who want to understand weight, length, and head-circumference charts before a pediatric visit.

The product boundary is important: a percentile is a comparison, not a grade, and the trend across visits matters more than one isolated number. The tool is educational and does not diagnose.

The current experiment is whether clearer explanations and a no-sign-up calculator can improve a page that already has Google impressions but a low click-through rate.

Live tool: https://babypercent.com/

I would value feedback on the calculator flow, wording, and what context parents need before they see the result.