Baby Age in Months Calculator
Turn a birth date into completed calendar months and total days. A clear way to keep track of your baby's age.
Enter your baby's birth date
Your dates stay in this browser. They are not sent to our server or saved.
Your result
Count completed calendar months
A completed month runs from a birth date to its next monthly anniversary. For example, a baby born on 15 June has completed 7 months on 14 February and 8 months on 15 February.
The result also shows years and remaining months, plus the total number of days since birth. The birth date itself is day zero for elapsed days.
When a month has fewer days
If the original day does not exist in the target month, the monthly anniversary falls on that month's last day. A baby born on 31 January completes one month on 28 February in a non-leap year.
This page reports calendar age only. It does not calculate corrected age for premature birth or assess development, feeding needs or medical milestones.
Frequently asked questions
Are four weeks the same as one month?
No. Four weeks is 28 days, while calendar months have different lengths. This tool counts completed calendar months.
How are years and months displayed?
Every 12 completed months is shown as one year. For example, 14 completed months is 1 year and 2 months.
Is the birth date stored?
No. The date is used in your browser for this calculation and is not sent to our server or saved.