Doctors talk about age in weeks for the first 3 months, in months until age 2, then in years.
| Next milestone day | Date |
|---|---|
| 1st birthday | Wed, 15 Jul 2026 |
| 500 days | Fri, 27 Nov 2026 |
| 2nd birthday | Thu, 15 Jul 2027 |
| 1000 days | Mon, 10 Apr 2028 |
This calculator is also in our free app. Sign in with the same account to keep your history in sync.
Babies' ages are counted in weeks for the first three months, then in months until age 2. Enter the date of birth to get the exact age in years, months and days, in weeks and in total days.
The calculator also lists the dates of upcoming milestones such as 100 days, the half-birthday and the first birthday.
| Date of Birth | 15 Jul 2025 |
| Age on Date | 15 Jan 2026 |
| Baby's age | 6 months 0 days |
| In weeks | 26 weeks 2 days |
| In days | 184 days |
| In months | 6 completed months |
| Born on a | Tuesday |
6 months 0 days; 26 weeks 2 days.
Try this example →About 13 weeks.
Add 100 days to the birth date — the calculator shows the exact date.
About 26 weeks: months are longer than 4 weeks (a month averages 4.35 weeks).