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Important Milestones: Your Baby By Four Months

How your child plays, learns, speaks, acts, and moves offers important clues about your child’s development. Developmental milestones are things most children can do by a certain age.

Check the milestones your child has reached by the end of 4 months. Take this with you and talk with your child’s doctor at every visit about the milestones your child has reached and what to expect next.

What most babies do by this age:

Social and Emotional

baby on floor with toy

Cognitive (learning, thinking, problem-solving)
Movement/Physical Development
  • Holds head steady, unsupported
  • Pushes down on legs when feet are on a hard surface
  • May be able to roll over from tummy to back
  • Can hold a toy and shake it and swing at dangling toys
  • Brings hands to mouth

  • When lying on stomach, pushes up to elbows


Act early by talking to your child’s doctor if your child:

  • Doesn’t watch things as they move
  • Doesn’t smile at people
  • Can’t hold head steady
  • Doesn’t coo or make sounds
  • Doesn’t bring things to mouth
  • Doesn’t push down with legs when feet are placed on a hard surface
  • Has trouble moving one or both eyes in all directions

If You’re Concerned – Act Early

Tell your child’s doctor or nurse if you notice any of these signs of possible developmental delay for this age, and talk with someone in your community who is familiar with services for young children in your area, such as your state’s public early intervention program. For more information, visit our "If You’re Concerned" web page or call 1-800-CDC-INFO.

The American Academy of Pediatrics recommends that children be screened for general development using standardized, validated tools at 9, 18, and 24 or 30 months and for autism at 18 and 24 months or whenever a parent or provider has a concern. Ask your child’s doctor about your child’s developmental screening.

“Learn the signs. Act early.” materials are not a substitute for standardized, validated developmental screening tools.

Adapted from CARING FOR YOUR BABY AND YOUNG CHILD: BIRTH TO AGE 5, Fifth Edition, edited by Steven Shelov and Tanya Remer Altmann © 1991, 1993, 1998, 2004, 2009 by the American Academy of Pediatrics and BRIGHT FUTURES: GUIDELINES FOR HEALTH SUPERVISION OF INFANTS, CHILDREN, AND ADOLESCENTS, Third Edition, edited by Joseph Hagan, Jr., Judith S. Shaw, and Paula M. Duncan, 2008, Elk Grove Village, IL: American Academy of Pediatrics.