Out of the mouth of (your) babe The Boston Globe
BIRTH TO 2 MONTHS
Crying, burping

3 TO 5 MONTHS
Cooing, gurgling

6 TO 8 MONTHS
Babbling vowel sounds (oooo, ahhh)

9 TO 11 MONTHS
Babbling consonant sounds (bbbb, mmmmm), then syllables (bababa, cacaca)

12 TO 15 MONTHS
First recognizable word, typically a noun; the second word follows about a month after the first

16 TO 26 MONTHS
A vocabulary of about 50 words, often expressed in one-word sentences (Go! Up! Mine!)

24 TO 27 MONTHS
Two-word combinations (''Daddy come," ''baby up")