Interactive gooing &
Cooing, mimicking your 2-4 mo.
Old baby's sounds & facial expressions promotes social communication. At 6-9 mos, strings of consonants shorten to "da-da, ma-ma." your delight promotes their becoming specific by 12 mos. Promote non-verbal communication; respond to uplifted arms @ 6 mos. By picking baby up. Sign-language, reading & expanding baby's utterances so he knows he's communiting all help.