2 MONTHS:

• Makes sounds other than crying
• Reacts to loud sounds

4 MONTHS:

• Makes sounds like “oooo”, “aahh” (cooing)
• Makes sounds back when you talk to them
• Turns head towards the sound of your voice

6 MONTHS:

• Takes turns making sounds with you
• Blows “raspberries” (sticks tongue out and blows)
• Makes squealing noises

9 MONTHS:

• Makes a lot of different sounds like “mamama” and “bababa”
• Lifts arms up to be picked up

12 MONTHS:

• Waves “bye-bye”
• Calls a parent “mama” or “dada” or another special name
• Understands “no” (pauses briefly or stops when you say it)