-
Period: to
2 months
infants coo, making pleasant vowel sounds -
Period: to
4 months on
infants observe with interest as the caregiver plays turn-taking games, such as pat-a-cake and peek a boo. -
Period: to
6 months on
infants babble, adding constants to their cooing sounds and repeating syllables. By 7 months, babbling starts to include many sounds of spoken languages. Infants begin to comprehend a few commonly heard words. -
Period: to
12 months
babbling includes sound and intonation patterns of the child's language community. Speed accuracy of owrd comprehension increase rapidly. Toddlers say their first recognizable word -
Period: to
18-24 months
Spoken vocabulary expands from about 50 to 200 to 250 words. Toddlers combine two words