Pregnancy, Baby & Child Age Tools
These tools follow a child from pregnancy to the first day of school. Each one does exact calendar arithmetic, then applies a documented rule — a screening publisher's age windows, a prematurity adjustment, or a state's kindergarten cutoff.
An age result tells you which form or school year applies; it is not a developmental assessment or a readiness judgement. Screening pages do not reproduce the questionnaires and are not affiliated with their publishers.
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Pregnancy & newborn
Weeks of pregnancy, exact baby age, and corrected age for babies born early.
Developmental screening windows
Which ASQ-3 interval or Brigance Screens III age to use, with each publisher's own rounding and prematurity rules.
School entry
Kindergarten age eligibility for a chosen state and school year.