Canonical babble (single syllables)
6mo
Variegated babble (combines syllables)
9mo
Conversational babble
10-12mo
Jargon
12-18mo
1-3 words
12mo
6-20 words
18mo
2 word phrases
2y
3-4 word phrases
3y
Complex narrative/sequence
4y
Tells a story
5y
Turns head to rattle
4-5mo
Understands “bye-bye”, “no”
6-9mo
Responds to name
9mo
Follows simple instruction
12-18mo
Points to 2 pictures
18mo
Body parts
18mo
Understands nouns
18mo
Understands verbs
2y
Animal noises
2y
Name 4 pictures
2y
Understands prepositions
2.5y
Knows 2-4 colours
3y
Counts 1-2 blocks
3y
Comparatives and opposites
4y