Baby Milestones: Complete Development Guide, 0 to 36 Months
Second Year Milestones
- 12–15 months: Walks independently, uses 1–5 words, points to communicate, follows simple one-step instructions, imitates actions
- 15–18 months: Stacks 2–4 blocks, vocabulary of 5–20 words, runs (unsteadily), uses spoon, beginning pretend play
- 18–24 months: Vocabulary explosion (50+ words), combines 2 words ("more milk"), kicks a ball, identifies body parts, parallel play begins
The AAP recommends developmental screening at 9, 18, and 30 months — and whenever you have concerns between those appointments.
When to Talk to Your Pediatrician
Contact your pediatrician if your baby:
- Has not smiled by 3 months
- Does not babble by 6 months
- Does not say single words by 12 months
- Does not point or wave by 12 months
- Does not say two-word phrases by 24 months
- Loses skills they previously had at any age
Early intervention is highly effective — the brain is most plastic in the first 3 years of life. Never "wait and see" if you have concerns.
Development by Age
Each page includes full milestones, sleep schedule, feeding guide, and activities.
Milestone & Development Articles
Frequently Asked Questions
What are the most important milestones at 6 months?
At 6 months: sits with minimal support, rolls in both directions, reaches and grasps objects intentionally, babbles (consonant sounds like ba, da), laughs, tracks moving objects well, and shows clear preference for familiar people. Weight should be approximately double birth weight.
My baby isn't crawling — is that normal?
Yes — not all babies crawl. Some bottom-shuffle, commando crawl, roll, or go straight to pulling to stand. The AAP removed crawling from its milestone list because so many normal babies skip it. What matters is that baby is finding ways to move independently and meeting other milestones on track.
When do babies start walking?
Most babies take their first independent steps between 9–12 months, with the average around 12 months. Walking independently by 15 months is within the normal range. If your baby isn't walking by 18 months, discuss with your pediatrician.
When do babies say their first words?
Most babies say their first meaningful words between 10–14 months. Words count when used intentionally and consistently to refer to something specific — 'mama' for mother, 'ba' for ball, etc. By 12 months, most babies have 1–3 words. By 18 months, 10–25 words. By 24 months, 50+ words and two-word combinations.
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