Related milestones

Generally happy when not hungry or tired

Is not upset by everyday sounds

Reacts to sudden noises or sounds

Uses both hands to explore toys

Brings hands and objects to mouth

Able to calm with rocking, touching, and gentle sounds (at 4-6 months)

Enjoys a variety of movements (at 4-6 months)

Listens and responds when spoken to

Begins to use consonant sounds in babbling, e.g. “da, da, da”

Uses babbling to get attention

Makes different kinds of sounds to express feelings