1 month

Lift head a little when lying on stomach

Watch objects for a short time

Make "noise in throat" sounds

Stay away from annoying sensations, such as a cloth or blanket on the face

2 months

Hold their heads up (bobbing when held in sitting position)

Sometimes imitate or respond to a smiling person

Roll partway to side

Make sounds of discomfort

3 months

Lift head and chest when lying on stomach

Recognize bottle or breast

Smile when talked to

Show active body movement

Follow moving things with their eyes

* For more information, see Developmental Milestones by the End of 3 Months on the American Academy of Pediatrics' Web site.

4 months

Hold head up for a long time without bobbing

Laugh out loud

Roll from front to back

Like to play

Grab an object held near their hand

Make sounds when talked to

6 months

Sit with little support

Respond to a friendly voice with a smile or coo

Roll from back to stomach

Turn and look when hearing sounds

Change object from hand to hand and from hand to mouth

* For more information, see Developmental Milestones by the End of 6 Months on the American Academy of Pediatrics' Web site.

9 months

Sit alone and change positions

Say "mama" and "dada"

Crawl

Respond to people they know

Respond to their own name

* For more information, see Developmental Milestones by the End of 9 Months on the American Academy of Pediatrics' Web site.

12 months

Pull themselves to stand and occasionally step with support

Nod their heads to signal "yes"

Give love

Pick things up with thumb and one finger

Say two or three words

* For more information, see Developmental Milestones by the End of 12 Months on the American Academy of Pediatrics' Web site.

15 months

Walk without support

Do some self-feeding

Speak and make their voice go up and down

Drink from a cup held by someone

Use four or five words

18 months

Walk (may run a bit)

Use five to 10 words

Climb up or down one stair

Pull toys that have wheel

Mark on paper with crayons

Understand easy directions

* For more information, see Developmental Milestones by the End of 18 Months on the American Academy of Pediatrics' Web site.

2 years

Give toys when asked

Recognize a familiar picture and know if it is upside down

Kick a large ball

Turn pages in a book (two or three at a time)

Use two or three words together, such as "more juice"

* For more information, see Developmental Milestones by the End of 2 Years on the American Academy of Pediatrics' Web site.

3 years

Walk up stairs holding railing

Unbutton large buttons

Stand for a moment on one foot

Talk of toilet needs

Open doors

Stack objects by size

Ask and answer simple questions

Speak clearly and be understood by family members

* For more information, see Developmental Milestones by the End of 3 Years, Developmental Milestones by the End of 4 Years, and Developmental Milestones by the End of 5 Years on the American Academy of Pediatrics' Web site.

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