Developmental milestones for 9 months old baby

PHYSICAL CHARACTERISTICS AND MOTOR SKILLS

A 9 month old generally has reached the following milestones:

Gains weight at a slower rate -- approximately 15 grams per day, 1 pound per month
Increases in length by 1.5 centimeters per month
Becomes more regulated in bowel and bladder systems
Shows parachute reflex to protect self from falling
Is able to crawl
Remains sitting for prolonged periods
Pulls self to standing position
Has a pincer grasp between thumb and index finger
Feeds self
Throws or shakes objects

SENSORY AND COGNITIVE SKILLS

The 9 month old typically:

Is developing depth perception
Achieves "object constancy", the understanding that objects continue to exist even when not seen
Responds to simple commands
Responds to name
Understands the meaning of "no"
Imitates speech sounds
May be afraid of being left alone
Plays interactive games