The following guideline describes the various physical, cognitive, emotional, and social developmental changes and milestones to be expected during the first year of life.
It is of utmost importance to remember that the timeline is approximate, not absolute. Each child develops at his or her own pace, and some stages may occur earlier or later.

Differences between the timing in this guideline and your child may exist, but do not necessarily mean that there is a problem with your baby's development. Any concerns, however, should be discussed with your physician.

Physical

• Growth
  • Gains 12g/day, 13oz/month
  • Length inc. 1.2 cm/month
• Movement and Activity
  • Grasps object between thumb and forefinger ("pincer grasp")

Cognitive

• Will search for an object when it is taken away, understands that it exists even though it can no longer be seen ("object constancy")

Social/Emotional

• Communication
  • Single syllable "words" ("ma", "da")
  • Understands "no"
  • Inflection with babbling

10 MONTHS OLD

Physical

• Growth
  • First molars erupt
• Movement and Activity
  • Sits up alone and indefinitely
  • Crawls on hands and knees
  • Crawls up stairs
  • Walks while holding on to furniture (cruising)
  • Walks with 2 hands held

Cognitive

• Understands simple phrases
• Follows simple directions
• Associates "mama" with mother and "dada" with father
• Can find objects by name when asked

Social/Emotional

• Waves
• Plays "peek-a-boo"
• Tests autonomy (crawls away from mother and checks for her reaction)
• Communication
  • First "real" words ("mama", "baba")
  • Conversational babbling