Baby Milestones by Month
Every baby develops at their own pace, but understanding typical milestones helps you celebrate progress and know when to ask questions. Explore our complete, medically-informed guide from 1 month through 3 years.
First Year (1–12 Months)
The most rapid period of development in your baby's life, from reflexive newborn to curious explorer on the move.
1 Month Old
First Smiles & Reflexes
2 Months Old
Cooing & Social Smiles
3 Months Old
Discovering Hands & Laughing
4 Months Old
Rolling Over & Reaching
5 Months Old
Sitting Up & Babbling
6 Months Old
Sitting Solo & Starting Solids
7 Months Old
Crawling Begins & Pincer Grip
8 Months Old
Pulling to Stand & Finger Foods
9 Months Old
Cruising & Understanding Words
10 Months Old
Standing Solo & First Words
11 Months Old
First Steps & Gestures
12 Months Old
Happy First Birthday!
Toddler (13–24 Months)
Walking, talking, and asserting independence, the toddler months are full of big changes and bigger personalities.
13 Months Old
Confident Walking & Exploring
14 Months Old
Language Explosion Begins
15 Months Old
Running & Following Directions
16 Months Old
Vocabulary Building & Climbing
17 Months Old
Pretend Play & Two-Word Phrases
18 Months Old
The Vocabulary Explosion
19 Months Old
Sentences & Independence
20 Months Old
Imagination & Problem-Solving
21 Months Old
Longer Sentences & Social Awareness
22 Months Old
Questions & Counting
23 Months Old
Almost Two & Full of Personality
24 Months Old
Happy Second Birthday!
Preschooler (25–36 Months)
Language is flourishing, friendships are forming, and your child's imagination knows no bounds as they approach their third birthday.
25 Months Old
Creative Storytelling
26 Months Old
Running, Jumping & Negotiating
27 Months Old
Friendship & Empathy
28 Months Old
Pretend Worlds & Big Feelings
29 Months Old
Letter Recognition & Routine Mastery
30 Months Old
Half-Birthday & Potty Training
31 Months Old
Complex Play & Conversations
32 Months Old
Preschool Preparation
33 Months Old
Mastering Self-Care
34 Months Old
Storytelling & Logic
35 Months Old
Counting, Colors & Cooperation
36 Months Old
Happy Third Birthday!
Special Day Milestones
Celebrate these remarkable numerical milestones. Each one marks a special moment in your baby's journey.
Want to know your baby's exact age in days, weeks, and months?
Try the Baby Age CalculatorFrequently Asked Questions
What are baby milestones?
Baby milestones are key developmental skills that most children reach by a certain age, like rolling over, sitting up, first words, and walking. They cover physical, cognitive, social, and language development from birth through age 3.
When should I worry about a missed milestone?
Every baby develops at their own pace, and there's a wide range of normal. Talk to your pediatrician if your baby hasn't reached a milestone by the upper end of the typical age range, or if you notice a loss of skills they previously had.
Are premature baby milestones tracked differently?
Yes. Doctors use 'adjusted age' (corrected for prematurity) when tracking milestones for babies born before 37 weeks. A baby born 2 months early is expected to reach milestones about 2 months later than their actual birth date suggests, until around age 2-3.
What are the most important milestones in the first year?
Key first-year milestones include social smiling (2 months), rolling over (4-6 months), sitting without support (6-7 months), crawling (7-10 months), first words (around 12 months), and early steps (9-12 months). Every baby reaches these at their own pace.