1 - 2 months  

able to suck and swallow
startled by loud noise
pays attention to faces
   nearby

3 - 4 months   

holds a rattle and smiles
holds head up well
shows gains in height and
   weight

    4 - 6 months   

reaches for and grasps objects
moves toys from hand to hand
smiles at others
rolls from tummy to back and
   back to tummy

   6 - 9 months   

babbles and laughs out loud
sits up without help
plays peek-a-boo and
   pat-a-cake
creeps or crawls forward on tummy by moving arms and legs

    9 - 12 months   

pulls to a stand
picks up small objects
waves "bye-bye"

    12 - 15 months

walks by holding onto  
    furniture
drinks from a cup
takes turn rolling a ball

    15 - 18 months   

looks at picture books
likes to push, pull and dump things
tries to talk and repeat
   words
walks without help

    18 - 24 months    

carries objects while walking
uses 2 or 3 word sentences
gives hugs and kisses
follows simple directions

    24 - 30 months    

runs well, with few falls
holds a crayon, likes to
   scribble
turns door knob, unscrews
    jars
can eat without help

   30 months and older    

helps with getting dressed
walks up and down stairs
sings simple songs
understands right from wrong