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Developmental milestones record - 9 months

Alternative names

This article describes the skills and growth markers relevant to 9 month-old infants.


A 9 month-old generally has reached the following milestones.

Physical characteristics and motor skills:

  • Weight gain slows down to approximately 15 grams per day, 1 pound per month
  • Length should increase by 1.5 centimeters per month
  • Bowel and bladder systems become more regulated
  • Parachute reflex to protect self from falling
  • Has the ability to crawl
  • Can remain sitting for prolonged periods
  • May pull self to standing position
  • Begins preference for dominant hand
  • Has a pincer grasp between thumb and index finger

Sensory and cognitive:

  • Development of depth perception
  • Achieve "object constancy", the understanding that objects continue to exist even when not seen
  • Can respond to simple commands
  • Understands the meaning of no
  • Imitates speech sounds
  • May be afraid of being left alone
  • Provide picture books
  • Provide different stimuli:
    • Go to the mall (people)
    • Go to the zoo (animals)
  • Play ball
  • Build vocabulary by reading and naming people and objects in the environment
  • Teach hot and cold through play
  • Provide large toys that can be pushed to encourage walking

Update Date: 4/15/2003

Elizabeth Hait, M.D., Department of Pediatrics, Rainbow Babies and Children's Hospital, Case Western Reserve University, Cleveland, OH. Review provided by VeriMed Healthcare Network.

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Last updated: Tue, 06 Jan 2009 00:20:03 GMT