Baby Age Calculator
Track your baby's exact age in months and weeks — and see which developmental milestones are coming up next.
Baby Developmental Milestones
| Age | Key Milestones |
|---|---|
| 1 month | Follows objects with eyes, responds to sound |
| 2 months | Social smiling begins |
| 4 months | Holds head steady, laughs |
| 6 months | Sits with support, starts solid foods |
| 9 months | Crawling, pincer grasp developing |
| 12 months | First steps, first words |
| 18 months | Walking well, vocabulary growing |
| 24 months | Two-word phrases, runs confidently |
Frequently Asked Questions
Why is baby age counted in months?
Infant development happens so rapidly that a 3-month-old and a 9-month-old are at completely different developmental stages — years alone are far too coarse a measure.
When does a baby become a toddler?
Generally around 12–18 months, when walking begins. The toddler stage is typically considered ages 1–3 years.