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Developmental milestones offer a general sense of what to expect, but the ranges are wide on purpose — a "normal" baby can hit any given milestone weeks or even months earlier or later than another baby and be perfectly healthy.
A general overview by age
| Age | Common milestones |
|---|---|
| 1-2 months | Social smiling, following objects with eyes, lifting head briefly during tummy time |
| 3-4 months | Cooing, holding head steady, bringing hands together |
| 5-6 months | Rolling over, babbling, reaching for objects |
| 7-9 months | Sitting without support, crawling, responding to name |
| 10-12 months | Pulling to stand, first words, cruising along furniture |
Milestone categories worth tracking
- Gross motor — head control, rolling, sitting, crawling, standing.
- Fine motor — grasping, reaching, transferring objects hand to hand.
- Language/communication — cooing, babbling, responding to sounds, first words.
- Social/emotional — smiling, recognizing familiar faces, showing preferences.
Why the ranges are so wide
Genetics, birth timing (especially for babies born early), temperament, and simple individual variation all affect the pace of development. A wide "normal" range reflects real biological variation, not imprecise science.
When to talk to your pediatrician
Well-child visits are built around milestone check-ins for exactly this reason — your pediatrician tracks patterns over time, not just a single visit. It's worth raising a concern if your baby seems to be losing a skill they previously had, or is notably behind across multiple categories at once, rather than a single milestone.
