🍼 Baby Age Calculator
Enter your baby’s date of birth to see their exact age in weeks and months, which is how growth milestones are usually tracked.
What this calculator does
The Baby Age Calculator works out exactly how old a baby is in weeks, months, and days from their date of birth, matching how growth and development are typically tracked in a baby’s first two years.
How the calculation works
The calculator counts the total number of calendar days between the birth date and today, then converts that into complete weeks (with leftover days), complete months, and complete years using standard calendar month lengths.
This tool is for general and educational tracking purposes, such as noting milestones or sharing your baby’s age with family. It is not a substitute for a pediatrician’s assessment of growth or development.