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Overview
 
Approximate Age
Motor Milestone
Cognitive/Social Milestone
Infant  
3 months
  • Holds head up
  • Moro reflex disappears
  • Social smile
  • "Mama, dada"
4-5 months
  • Rolls front to back
  • Sits when propped
  • Recognizes people
7-9 months
  • Sits alone
  • Crawls
  • Stranger anxiety
  • Orients to voice
12-14 months
  • Babinski disappears
  • Should be taking first steps
  • Few words
  • Separation anxiety
15 months
  • Walking should be well-developed
  • Understand simple commands
Toddler  
12-24 months
  • Climbs stairs, stacks 3 blocks
  • Object permanence
18-24 months 
  • Stacks 6 blocks
  • Rapprochement
24-48 months  
  • Parallel play
24-36 months  
  • Core gender identity
Preschool  
30-36 months
  • Stacks 9 blocks (note: blocks stacked = age in years x 3)
  • Toilet training
3 years 
  • Rides tricycle
  • Copies line or circle drawing
  • Group play
  • Simple sentences
4 years
  • Simple drawings (stick figure)
  • Hops on 1 foot
  • Cooperative play
  • Imaginary friends
  • Grooms self
  • Grushes teeth
  • Speaks in complex sentences
School Age  
6-11 years
  • Reads
  • Understands death
  • Development of conscience (superego), same-sex friends, identifcation with same sex parent
Adolescence  

11 yrs (girls)

13 yrs (boys)

 
  • Abstract reasoning (formal operations)
  • Formation of personality
 
Tanner Stages of Sexual Development
 
Stage
Male Changes
Female Changes
1
  • Childhood
  • Childhood
  • Pubic hair develops
  • ↑ testes size
  • Pubic hair develops
  • Breast tissue elevation
3
  • ↑ pubic hair, darkens, becomes curly 
  • ↑ penis size/length
  • ↑ pubic hair, darkens, becomes curly
4
  • ↑ penis width
  • Darker scrotal skin
  • Development of glans
  • Raised areola
5
  • Adult
  • Adult
  • Areola is no longer raised

References

 

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