What are the Developmental Milestones by Age?

Developmental milestones are key skills that most children achieve by specific ages across four primary domains: social/emotional, language/communication, cognitive, and physical development. Based on CDC guidelines provided by Heart Core ABA, here is a breakdown of milestones by age group:

0–12 Months

  • Social/Emotional: Smiling at people and copying facial expressions.
  • Language: Making sounds, babbling by 6–9 months, and responding to their name.
  • Cognitive: Exploring objects with hands and finding hidden items by 9 months.
  • Physical: Holding the head steady, rolling over by 4–6 months, and pulling to stand by 9 months.

1–2 Years

  • Social/Emotional: Showing independence and playing simple games like pat-a-cake.
  • Language: Saying several single words (e.g., mama) by 12–18 months and following simple instructions.
  • Cognitive: Sorting shapes and completing simple sentences.
  • Physical: Walking alone (usually by 12–18 months) and pulling toys.

2–3 Years

  • Social/Emotional: Copying adults, taking turns, and engaging in imaginative play.
  • Language: Speaking in sentences and naming colors.
  • Cognitive: Understanding counting and engaging in fantasy play.
  • Physical: Kicking a ball, climbing, and standing on one foot.

If a child does not babble or respond to their name by 12 months, or is not walking independently by 18 months, professionals recommend seeking an evaluation to address potential developmental delays.


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