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Your Baby Week Twelve

By Vincent Iannelli, M.D., About.com

Updated: November 7, 2007

About.com Health's Disease and Condition content is reviewed by Kate Grossman, MD

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Week Twelve Developmental Milestones

By three months, your baby may be able to lift her head and chest when on her tummy.

By three months, your baby may be able to lift her head and chest when on her tummy.

Photo © Tari Faris
Watching your baby's growth and development can be fun and exciting.

Unfortunately, in your baby's first few months, besides smiling and laughing, there haven't been that many developmental milestones to get very excited about.

A lot begins to happen around twelve weeks though. In addition to her second month milestones, your baby may begin to:

  • hold her head up at a 90-degree angle
  • sit with support and hold her head steady
  • bear weight on her legs
  • roll over
  • lift her chest up when she is on her tummy and support herself on her arms
  • turn to a rattling sounds and imitate speech sounds
  • hold her hands together and grasp a rattle
  • follow objects through a 180-degree angle
To help your baby meet these milestones, it can be a good idea to use tummy time each day and talk to your pediatrician if you feel that your baby has a developmental delay.

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