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Baby age calculator

Your child's age in weeks, months and days, from their birth date.

Enter your child's birth date to see their age in years, months and days, and in weeks. Born early? Use the adjusted age calculator, which also takes the due date. Everything is worked out in your browser, and nothing is sent to us.

Checked October 29, 2026.

How it counts

Months are calendar months: a baby born on the 15th is one month old on the 15th of the next month. Weeks are whole 7-day weeks since the birth date.

Privacy

The dates stay on this page. If you tick “Remember”, they're kept in this browser only, and you can untick it to delete them.

Sources