My child isn't doing something listed for their age. Should I worry?

Usually not. Milestones are wide ranges and most children arrive on their own schedule. Watch the trend over weeks rather than a single day, and use the "when to talk to your pediatrician" list on each page as your guide.

Where do these milestones come from?

From the CDC Developmental Milestones (2023) and the AAP Bright Futures guidelines (2024), the same references pediatricians use, alongside WHO child-growth standards.

How accurate are these milestones for premature babies?

For babies born early, use their corrected age (age counted from the due date, not the birth date) until about age two. A baby born two months early is developmentally closer to a baby two months younger, so measure milestones from the corrected age and mention the prematurity to your pediatrician.

Should I worry if my child reaches milestones earlier than typical?

No. Arriving ahead of the typical range is simply your child's own pace and is not something to slow down or worry about. Keep offering everyday play and conversation; there is no need to push the next stage.

What if my twins are developing at different paces?

That is normal. Twins are two individuals and often reach milestones weeks apart, especially if one was smaller at birth. Compare each child to the typical ranges rather than to each other, and use corrected age if they were born early.

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child_care Development snapshot

Child development, age by age

What's typical at each age, what helps right now, and when to check in, grounded in CDC and AAP milestones, and written to reassure, not alarm. Choose an age to begin.

NewbornFeeding, sleep & bonding 2 moCooing, smiling & head control 4 moRolling, laughing & babbling 6 moSitting, first foods & babbling 9 moCrawling, pulling up & first words 12 moFirst words & gestures 15 moWalking & first words 18 moLanguage explosion 2 yrTwo-word phrases & pretend play 3 yrConversation & social play 4 yrStories, friendships & big feelings 5 yrSchool readiness & early reading 6 yrReading, writing & real friendships 7 yrFluent reading & growing independence 8 yrIndependent learning & deeper friendships

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Milestones are ranges, not deadlines

Every child grows on their own timeline. These guides describe what many children do around each age, not a test to pass. Reaching something earlier or later is usually still normal, and each page flags the few signs genuinely worth asking your pediatrician about.

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What's inside each age guide

A plain-language summary, at a glance
What helps this month: age-matched activities
The questions parents actually search for
What this age feels like in real life
Milestones across movement, speech, feeding, sleep and social
When to talk to your pediatrician

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Based on CDC Developmental Milestones (2023) and AAP Bright Futures (2024). Educational only, not a substitute for medical advice. Last reviewed 1 June 2026.Reviewed against:

CDC Developmental Milestones
AAP Bright Futures
WHO Child Development Guidance

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Frequently asked

My child isn't doing something listed for their age. Should I worry?: Usually not. Milestones are wide ranges and most children arrive on their own schedule. Watch the trend over weeks rather than a single day, and use the "when to talk to your pediatrician" list on each page as your guide.
Where do these milestones come from?: From the CDC Developmental Milestones (2023) and the AAP Bright Futures guidelines (2024), the same references pediatricians use, alongside WHO child-growth standards.
How accurate are these milestones for premature babies?: For babies born early, use their corrected age (age counted from the due date, not the birth date) until about age two. A baby born two months early is developmentally closer to a baby two months younger, so measure milestones from the corrected age and mention the prematurity to your pediatrician.
Should I worry if my child reaches milestones earlier than typical?: No. Arriving ahead of the typical range is simply your child's own pace and is not something to slow down or worry about. Keep offering everyday play and conversation; there is no need to push the next stage.
What if my twins are developing at different paces?: That is normal. Twins are two individuals and often reach milestones weeks apart, especially if one was smaller at birth. Compare each child to the typical ranges rather than to each other, and use corrected age if they were born early.

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Sources: CDC Developmental Milestones (2023 Update); AAP Bright Futures Guidelines (4th Edition, 2024); WHO Child Growth Standards. Every child develops at their own pace.