Developmental Milestones from Birth to 6 Years
Developmental milestones are the skills most children acquire by a certain age — rolling over, first words, walking, drawing a circle. The CDC's 2022 milestone update emphasizes skills that 75% or more of children should demonstrate by each checkpoint, making them clear flags for follow-up when missed.
Last reviewed: June 25, 2026
Calculators in this topic
Free, evidence-based tools — no signup, no data stored.
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.
The five ASQ-3 domains
Communication, gross motor, fine motor, problem solving, and personal-social. A child can be on track in four domains and need support in one — which is why a domain-by-domain calculator beats a single composite score.
How to time milestone checks
Knowing your child's exact age in months and days lets you match observations to the right milestone window. For preterm infants, use corrected age until 24 months.
Explore related topics
How developmental screening works, when to screen, and how to use validated tools like the ASQ-3 to catch delays early.
Why corrected age matters for premature infants, how to calculate it, and how to apply it to growth charts and developmental screening.