Alerts to sound
1mo
Smiles socially (after being stroked or talked to)
2mo
Coos (produces long vowel sounds in musical fashion)
3mo
Laughs, orients to voice
4mo
Babbles, ah-goo, razz, lateral orientation to bell
6mo
Says “mama, dada’ indiscriminately, gestures, waves bye-bye, understands “no”
9mo
Uses two words other than “mama, dada” or proper nouns, jargoning (runs several unintelligible words together with tone or inflection), one-step command with gesture
12mo
Uses 4-6 words, follows one-step command without gesture
15mo
Mature jargoning (includes intelligible words), 7-10 word vocabulary, knows 5 body parts
18mo
Uses pronouns (I, you, me) inappropriately, follows two-step commands, 50-word vocabulary, uses 2-word sentences
24mo
Uses minimum of 250 words, 3-word sentences, uses plurals, knows all pronouns, repeats two digits
3yo
Knows colors, says song or poem from memory, asks questions
4yo
Prints first name, asks what a word means
5yo
Looks at pictures in book, pats pictures
6-12mo
Points to pictures with a single finger, points to specific items on page, gives book to adult
12-18mo
Repeats and retells parts of known stories
18-24mo
Looks at favorite books on own, repeats and retells whole phrases and stories, associates pictures with text of story
24-36mo
Growing attention span, recites favorite stories, begins to identify single letters
3yo
Uses past tense and plurals, answers “what will happen next”
> 4yo
