Uses hands and mouth to explore objects

Turns eyes and head to sound of hidden voice

Localizes sound with eyes

Finds a partially hidden object

Looks around at things nearby

Brings things to mouth

Shows curiosity about things and tries to get things that are out of reach

Begins to pass things from one hand to the other

Fixes gaze on face

Reacts to sudden noises or sounds

Listens and responds when spoken to

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

Makes different kinds of sounds to express feelings

Notices toys that make sounds

Uses babbling to get attention

Rolls over in both directions (front to back, back to front)

Begins to sit without support

When standing, supports weight on legs and might bounce

Rocks back and forth, sometimes crawling backward before moving forward

Uses hands to support self while sitting

Rolls from back to tummy and tummy to back

While standing with support, accepts entire weight with legs

Reaches for nearby toys while on tummy

While lying on back, reaches both hands to play with feet

While lying on back, transfers a toy from one hand to the other

Knows familiar faces and begins to know if someone is a stranger

Likes to play with others, especially parents

Responds to other people’s emotions and often seems happy

Likes to look at self in a mirror

Reacts to sight of bottle or breast

​Comforts self with thumb or pacifier