Developmental milestones

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Age	Gross Motor	Fine Motor	Language	Social/Cognitive
1 year	Pulls to stand, Cruises	Pincer grasp	Says “mama” or “dada”, Understands “no”	Plays “pat-a-cake”, Looks for hidden object
15 months	Takes a few steps	Stacks 2 blocks	Says 1 or 2 words (plus “mama” & “dada”)	Follows 1-step command with gesture, Points to get something, Shows affection
18 months	Walks easily, Climbs on/off chair	Scribbles, Feeds with fingers	Says ≥3 words (plus “mama” & “dada”)	Follows 1-step command without gesture, Imitates
2 years	Runs, Kicks ball, Walks up stairs	Uses spoon	Says 2-word phrases, Knows 2 body parts	Parallel play
30 months	Jumps, Removes clothes	Turns pages	Says ≥50 words	Follows 2-step command, Knows 1 color
3 years	Walks up stairs alternating feet, Rides tricycle	Dresses with help, Uses fork	Copies circle, Says ≥3-word sentences, Speech 75% intelligible	Knows age/sex, Plays with other children

Common developmental behaviors

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• Stranger anxiety: when an infant is fearful of unknown individuals
  • Expected ages: 6 months–3 years
  • Clinical features: crying and/or clinging to a known caregiver when around strangers
• Separation anxiety: when an infant or young child is afraid of being separated from their caregiver
  • Expected ages: peaks between 9 and 18 months and resolves by 3 years of age
  • Clinical features
    • Crying and/or clinging to a caregiver if the caregiver tries to leave
    • Continued crying after a caregiver has left