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Developmental Milestones

Developmental Milestones

See Milestones In Action

9th month old boy

Milestones in Action is a FREE library of photos and videos of children showing developmental milestones.


Skills such as taking a first step, smiling for the first time, and waving "bye bye" are called developmental milestones. Children reach milestones in how they play, learn, speak, act, and move (crawling, walking, etc.).

Click on the age of your child to see the milestones:

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


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Video on Milestones

 Primer video del bebé

Learn how to look for developmental milestones and what to do if you’re worried about your child’s development or think there’s a problem.

Watch the video »

Child Development: It’s Better to Know (in Spanish)

 A young girl with her pet dog.

Learn why it is important to recognize developmental milestones and what to do if you have concerns about your child's development.

Watch this Spanish language video »


Content provided and maintained by the US Centers for Disease Control and Prevention (CDC). Please see our system usage guidelines and disclaimer.

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Last Reviewed: Nov 19, 2015