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Normal Development: 4 Months Old

Each child is unique. While some behavior and growth milestones tend to happen at certain ages, a wide range for each age is normal. It is okay if your child reaches some milestones earlier and others later than the average. If you have any concerns about your child's development, check with your healthcare provider. Here's what you might notice your baby doing between the ages of 4 months and 6 months of age.


  • Is active, playful, and likes people.
  • Enjoys being held, being talked to, and hearing singing.
  • Laughs and giggles while playing and socializing.


  • Basks in attention.
  • Turns head in response to human voice.
  • Smiles and coos when talked to.


  • Carefully studies objects placed in his hand.
  • Explores things by putting them into his mouth.
  • May start to realize that objects exist even when out of sight.


  • Usually sleeps through the night.
  • Reaches and grasps some objects.
  • Shakes rattle when placed in hand.
  • Focuses clearly.
  • Fascinated with mirror image.
  • Rolls from front to back.
  • Holds up chest when lying on tummy.
  • Supports head when held in sitting position.
  • Sits with support for longer periods.
  • Enjoys using the legs in kicking motions.
Written by Robert M. Brayden, MD, Professor of Clinical Pediatrics, University of Colorado School of Medicine.
Pediatric Advisor 2019.4 published by Change Healthcare.
Last modified: 2013-09-18
Last reviewed: 2018-05-09
This content is reviewed periodically and is subject to change as new health information becomes available. The information is intended to inform and educate and is not a replacement for medical evaluation, advice, diagnosis or treatment by a healthcare professional.
© 2018 Change Healthcare LLC and/or one of its subsidiaries
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