Social smile
6 weeks
Mouths objects
6m
Shakes rattle
6m
Object permanence
9m
Stranger danger
6m-2y
Plays peek-a-boo
9-12m
Waves and claps
12m
Pretend play (feeds doll with bottle)
18m
Symbolic play (feeds doll with blocks)
2y
Imaginative play (feeds doll with imaginary food)
3y
Names a friend
3y
Observes rules
5y
Eats well with spoon
2y
Bowel control
3y
Shows more advanced emotion (pride when praised)
18m
Dress/undress without help (minus buttons/laces)
4y
Concern/sympathy for others
4y
Dry by day
2y
Parallel play
2-2.5y