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When do babies sit, crawl, stand and walk?
The age ranges when healthy babies reached four movement milestones in the WHO study, plus CDC timing for smiling, talking and more.
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Sources: WHO Motor Development Study, Acta Paediatrica 95 (2006); CDC “Learn the Signs. Act Early.” milestone checklists. Checked October 2026.
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What is on this chart
Age in months
| When do babies | CDC and other official timing |
|---|---|
| Roll over | By 6 months, most babies (75% or more) roll from tummy to back, according to the CDC milestone checklist. |
| Start talking | The CDC milestones: "mama" or "dada" by 12 months, one or two other words by 15 months, three or more words by 18 months, two words together by 2 years and about 50 words by 30 months. |
| Smile | By 2 months, most babies smile when you talk to or smile at them, and by 4 months they smile on their own to get your attention (CDC). |
| Laugh | The CDC lists chuckling (not yet a full laugh) by 4 months and laughing by 6 months. |
| Hold their head up | By 2 months most babies hold their head up when on their tummy, and by 4 months they hold it steady without support when you hold them (CDC). |
| Start babbling | The CDC lists cooing ("oooo", "aahh") by 4 months and babbling sounds like "mamamama" and "babababa" by 9 months. |
| Clap | The CDC lists "claps when excited" by 15 months, and playing games like pat-a-cake by 12 months. |
| Wave | By 12 months, most babies wave "bye-bye" (CDC). |
| Point | By 15 months, most children point to ask for something or to get help, and by 18 months they point to show you something interesting (CDC). |
| Start eating baby food | The CDC says children can begin eating solid foods at about 6 months, and that starting before 4 months is not recommended. |
| Start teething | Baby teeth start to come in at about 6 months, according to the American Dental Association, and Seattle Children's Hospital says they come in between 6 and 24 months. There are 20 primary (baby) teeth. |
Sources: WHO Motor Development Study, Acta Paediatrica 95 (2006); CDC "Learn the Signs. Act Early." milestone checklists (75% or more of children by each age). Worried? Ask your child's doctor.
