CDC checklist

4 Month Milestones

Here's what most children (75% or more) do by 4 months, according to the CDC. Tick off what you've seen and bring the list to your next checkup.

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Social and emotional

Language and communication

Learning and problem-solving

Movement and physical

If something worries you

You know your child best. If your child isn't reaching one or more milestones, has lost skills they once had, or you have other concerns, talk with your child's doctor. The CDC says not to wait. You can also contact your state's early intervention program at cdc.gov/FindEI.

Things to try at 4 months (from the CDC)

  • Respond positively to your baby. Act excited, smile, and talk to him when he makes sounds. This teaches him to take turns "talking" back and forth in conversation.
  • Provide safe opportunities for your baby to reach for toys, kick at toys and explore what is around her. For example, put her on a blanket with safe toys.
  • Allow your baby to put safe things in his mouth to explore them. This is how babies learn. For example, let him see, hear, and touch things that are not sharp, hot, or small enough to choke on.

Source: CDC, What most children do by 4 months (CDC Learn the Signs. Act Early. milestone checklists), retrieved 2026-10-16. These checklists don't replace developmental screening by your child's doctor. Sprout Diary is not a medical service.