Calculator
Baby-age calculator
Calculate your baby’s age in years, months, days and weeks from the date of birth.
Enter the date of birth. The tool shows age as years-months-days and as completed weeks.
Calculate
Result
Enter the details and press Calculate. The result will appear here.
How to use it
- Enter the date of birth.
- The result is counted to today.
- Both calendar age and week count are shown.
Points to watch
- Premature babies may also be discussed with corrected age; this tool uses calendar age from birth.
- Age bands in development articles are typical ranges, not a diagnosis.
Frequently asked questions
Is this the same as corrected age?
No. Corrected age is used mainly for babies born early and is set with a clinician. This tool counts from the birth date.
Why show weeks as well?
Some newborn and infant notes use weeks; the extra figure makes those guides easier to match.
Source and method note
Calendar age from date of birth is a simple count. It is not a developmental assessment.
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