Beautiful, evidence-based child development tools

Score the Ages & Stages Questionnaire (ASQ-3) instantly across all five domains. Free, accurate, and aligned with official cutoffs.

Convert your baby's date of birth to exact age in years, months, weeks, and days. Perfect for milestones, vaccinations, and pediatric visits.

Calculate adjusted (corrected) age for babies born preterm. Used to interpret growth, milestones, and screening tools accurately until 24 months.

Plot your baby's weight and length against WHO Child Growth Standards. Get percentiles and z-scores instantly.

Calculate Body Mass Index for children and teens with CDC age- and sex-specific percentile interpretation.

How much sleep does your child need? Get age-based total sleep hours, suggested bedtimes, and nap patterns based on AAP/AASM guidance.