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Developmental Milestones Overview

Sep 8, 2025

Overview

This lecture covers the CDC's Developmental Milestones, which are skills most children achieve by certain ages that relate to their play, learning, speech, behavior, and movement.

What Are Developmental Milestones?

  • Developmental milestones are abilities most children can do by a certain age, like walking or smiling.
  • These milestones cover five domains: play, learning, speaking, acting, and moving.

Milestone Age Categories

  • The CDC provides milestone checklists for various ages: 2, 4, 6, 9, 12, 15, 18, 24, 30 months, and 3, 4, 5 years.
  • Each checklist highlights typical skills expected by a specific age.

Monitoring Development

  • Caregivers and parents are encouraged to track children’s milestones and development regularly.
  • Tools such as printable checklists and a Milestone Tracker app are available to make tracking easier.
  • Resources and checklists are available in multiple languages.

Early Intervention and Action Steps

  • If a child misses milestones, loses previous skills, or if there are concerns, parents should talk to a healthcare provider.
  • The American Academy of Pediatrics recommends developmental screenings at 9, 18, and 30 months, and autism screenings at 18 and 24 months.
  • If concerns persist, request a specialist evaluation and contact the state early intervention program.

Additional Resources

  • The CDC provides videos and stories from families on using milestone resources.
  • There are digital, printable, and app-based options to support tracking and awareness.

Key Terms & Definitions

  • Developmental Milestone — A skill or ability most children can do by a certain age.
  • Developmental Screening — Use of standardized tools to check if children are learning basic skills when they should.
  • Early Intervention — Services that help young children with developmental delays or disabilities.

Action Items / Next Steps

  • Visit the CDC website to view milestone checklists by age.
  • Use the Milestone Tracker app or print out checklists to monitor a child's progress.
  • Consult a child’s doctor if any milestones are missed or lost, or if any concerns arise.
  • Learn about early intervention services through your state's resources.