When should babies roll over, sit up, and walk?

Most babies roll over at 4-6 months, sit without support at 6-8 months, crawl at 7-10 months, pull to stand at 9-12 months, and walk independently at 12-15 months. Remember that these are ranges - some babies skip crawling entirely, and variations are normal.

When should I be concerned about my child's development?

Talk to your pediatrician if your child loses skills they once had, doesn't meet multiple milestones for their age, has no babbling by 12 months, no words by 16 months, no two-word phrases by 24 months, or doesn't respond to their name. Early intervention is key for developmental delays.

What are the CDC milestone ages?

The CDC provides milestone checklists at 2 months, 4 months, 6 months, 9 months, 1 year, 15 months, 18 months, 2 years, 30 months, 3 years, 4 years, and 5 years. These checklists cover social/emotional, language/communication, cognitive, and movement/physical development.

Do premature babies reach milestones later?

Yes, premature babies often reach milestones later. Use your baby's 'adjusted age' (age minus weeks premature) when tracking development until age 2. For example, a 6-month-old born 2 months early would be compared to 4-month milestones. Most preemies catch up by age 2-3.

When do babies say their first words?

Most babies say their first meaningful words around 12 months, though babbling starts at 4-6 months. By 18 months, toddlers typically say 10-25 words, and by 2 years, most have 50+ words and start combining two words. Boys sometimes develop language slightly later than girls.

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Milestone Tracker

Q: What are developmental milestones?

Developmental milestones are skills and behaviors that most children can do by a certain age. They include physical skills (rolling over, walking), cognitive abilities (problem-solving), communication (babbling, first words), and social/emotional development. The CDC provides milestone checklists for ages 2 months through 5 years.

Last updated: June 2026

Track Your Child's Development

Get age-appropriate milestone expectations

Child's Age

Enter age in months (2-24) or years (1.5 = 18 months)

2 Months

6 Months

12m

1 Year

18m

18 Months

24m

2 Years

Common Questions

What are developmental milestones?

Should I be concerned if my child hasn't reached a milestone?

How do premature babies' milestones differ?

Can I help my child reach milestones faster?

How often should I track my child's milestones?

What should I do if I'm concerned about my child's development?

Development Guides

When Do Babies Roll Over?

Timeline and tips for this exciting milestone

When Do Babies Crawl?

What to expect and how to encourage mobility

When Do Babies Walk?

First steps timeline and safety tips

When Do Babies Talk?

Language development from coos to words

Medical Disclaimer

This calculator provides educational estimates only and is not a substitute for professional medical advice. Always consult your pediatrician or healthcare provider for guidance specific to your child.

Last reviewed: December 2024|

Sources:CDC Milestones AAP Development