Birth to 3 Months
- Alerts to sound.
- Quiets or smiles when you talk.
- Makes sounds back and forth with you.
- Makes sounds that differ depending on whether they are happy or upset.
- Coos, makes sounds like ooooo, aahh, and mmmmm.
- Recognizes loved ones and some common objects.
- Turns or looks toward voices or people talking
4 to 6 Months
- Giggles and laughs
- Responds to facial expressions.43
- Looks at objects of interest and follows objects with their eyes.
- Reacts to toys that make sounds, like those with bells or music
- Vocalizes during play or with objects in mouth.
- Vocalizes different vowel sounds—sometimes combined with a consonant—like uuuuuummm, aaaaaaagoo, or daaaaaaaaaa
- Blows “raspberries.”