Baby Age Calculator
Find your baby's exact age in months, weeks and days, and the corrected age for a baby born early.
For a baby born before 37 weeks, doctors use a corrected age for development until about age 2.
Age
6 months, 2 days
- In weeks
- 26 weeks, 4 days
- In days
- 186
Your baby is 6 months and 2 days old (26 weeks).
How it's worked out
- BornSunday, 10 May 2026
- Age
186 days26 weeks, 4 days
How it works
Age = today − date of birth · Corrected age = age − weeks born early
Worked example
A baby born on 10 May 2026 is 5 months and 16 days old on 26 October 2026, or 24 weeks and 1 day. If born 4 weeks early, the corrected age is 20 weeks and 1 day.
Questions people ask
How old is my baby in weeks?
Count the days since birth and divide by 7. A baby born on 10 May 2026 is 24 weeks and 1 day old on 26 October.
What is corrected age?
For a baby born before 37 weeks, the age counted from the due date instead of the birth date. Doctors use it to check development until about age 2.
When do I stop using corrected age?
Usually by about 2 years old, when most premature babies have caught up.
About this calculator
Formula and rules last checked 25 October 2026Written and tested by the CalculatorDex teamReport a problem