Repeats two digits
3 years
Follows 2-step command
24 months
Alerts to sound
1 month
Knows 5 body parts
18 months
Razz
6 months
7-10 word vocabulary
18 months
Uses at least 250 words
3 years
Mature jargoning
18 months
Lateral orientation to bell
6 months
Uses 4-6 words
15 months
Uses 2-word sentences
24 months
Knows colors
4 years
Follows one-step command without gesture
15 months
Understands “no”
9 months
Has a 50-word vocabulary
24 months
Knows all pronouns
3 years
Waves bye-bye
9 months
Recites song or poem from memory
4 years
Uses pronouns inappropriately
24 months
Babbles
6 months
Asks questions
4 years
Uses plurals
3 years
Asks what a word means
5 years
Orients to voice
4 months