| | Social-emotional | Language/communication | Cognitive | Motor |
| 2 months | - Calms down when spoken to or picked up
- Looks at your face
- Seems happy to see you when you walk up to them
- Smiles when you talk to or smile at them
| - Makes sounds other than crying
- Reacts to loud sounds
| - Watches you as you move
- Looks at a toy for several seconds
| - Holds head up when on tummy
- Moves both arms and both legs
- Opens hands briefly
|
| 4 months | - Smiles on their own to get your attention
- Chuckles when you try to make them laugh
- Looks at you, moves, or makes sounds to get or keep your attention
| - Makes sounds like "oooo" and "aahh" (cooing)
- Makes sounds back to you when you talk to them
- Turns head toward the sound of your voice
| - If hungry, opens mouth when they see breast or bottle
- Looks at their hands with interest
| - Holds head steady without support when you are holding them
- Holds a toy when you put it in their hand
- Uses their arm to swing at toys
- Brings hands to mouth
- Pushes up on elbows/forearms when on tummy
|
| 6 months | - Knows familiar people
- Likes to look at themselves in the mirror
- Laughs
| - Takes turns making sounds with you
- Blows "raspberries" (sticks out tongue and blows)
- Makes squealing noises
| - Puts things in their mouth to explore them
- Reaches to grab a toy they want
- Closes lips to show they do not want more food
| - Rolls from tummy to back
- Pushes up with straight arms when on tummy
- Leans on hands to support themselves when sitting
|
| 9 months | - Is shy, clingy, or fearful around strangers
- Shows several facial expressions (eg, happy, sad, angry, surprised)
- Looks when you call their name
- Reacts when you leave (eg, looks, reaches for you, or cries)
- Smiles or laughs when you play peek-a-boo
| - Makes different sounds like "mamamama" and "babababa"
- Lifts arms to be picked up
| - Looks for objects when dropped out of sight (eg, spoon, toy)
- Bangs 2 things together
| - Gets to a sitting position by themselves
- Sits without support
- Uses fingers to "rake" food toward themselves
- Moves things from 1 hand to the other hand
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