1st month:
make small cooing (dovelike) sounds

2nd months:
Differentiates a cry
Ability to make throaty, gurgling, or cooing sounds increases

3rd month:
squeal with pleasure

4th month:
Are very talkative- cooing, babbling and gurgling when spoken to
Laugh out loud

5th month:
Says some simple vowel sounds (goo-goo, gah-gah)

6th month:
Learns the art of imitation

7th- 8th month:
Can imitate vowels (oh-oh, ah-ah, oo-oo)

9th month:
Usually speaks a first word ba-ba, da-da or ma-ma

10th- 11th months:
masters another word such as bye-bye or no

12th month:
Can generally say two words besides ma-ma and da-da, they use those words with meaning