6 age groups

Social/Emotional Development Milestones

Track your baby's social/emotional development from birth to 24 months. See what to expect at every age.

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0-3 months
0-3 months5 milestones
  • Pays attention to faces
  • Smiles at people
  • Calms when spoken to or picked up
  • Acts bored if activity doesn't change
  • Shows happiness by kicking and waving
3-6 months
3-6 months6 milestones
  • Smiles spontaneously, especially at people
  • Likes to play with people; cries when play stops
  • Copies some movements and facial expressions
  • Knows familiar faces; may be shy with strangers
  • Reaches to be picked up
  • Laughs out loud
6-9 months
6-9 months6 milestones
  • Shy or nervous with strangers
  • Cries when parent leaves
  • Has favorite toys
  • Copies gestures (like clapping)
  • Enjoys playing peek-a-boo
  • Laughs at funny faces or sounds
9-12-months
9-12 months6 milestones
  • Shy or clingy with strangers
  • Has wide range of facial expressions
  • Plays simple games like peek-a-boo
  • Hands things to others during play
  • Shows empathy when others are upset
  • Tests reactions of caregivers
12-18-months
12-18 months7 milestones
  • Shows affection to familiar people
  • Points to show something interesting
  • Plays simple pretend (feeds doll)
  • May have temper tantrums
  • Shows independence
  • Hugs or kisses familiar people
  • Seeks comfort from caregiver when upset
18-24-months
18-24 months7 milestones
  • Notices and copies others
  • Gets excited when with other children
  • Shows more independence
  • Plays next to other children
  • Shows defiant behavior
  • Shows empathy and concern for others
  • Engages in parallel play with peers

View all Milestones Guide

Milestone criteria based on CDC and AAP research — sourced from the CDC's Learn the Signs. Act Early. program, developed in collaboration with the American Academy of Pediatrics. For informational purposes only; not endorsed by or affiliated with the CDC or AAP.

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Complete guide to baby social/emotional milestones from birth to 24 months. Covers 6 age groups with specific milestones for each developmental stage.