Baby age in weeks and months
Your baby's exact age in weeks, months and days, with the corrected age if born early.
How it works
Age in weeks = days since birth ÷ 7. Corrected age = actual age − (due date − birth date). Corrected age is used to follow the development of a premature baby, usually up to age 2.
Results are for guidance only and do not replace professional advice.
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Worked example
With the default values:
- Date of birth24 July 2026
you get:
- Age14 weeks + 2 days
- In months3 months + 8 days
- In days100 days
- StageInfant
Frequently asked questions
How does the “Baby age in weeks and months” tool work?
Age in weeks = days since birth ÷ 7. Corrected age = actual age − (due date − birth date). Corrected age is used to follow the development of a premature baby, usually up to age 2.
What do I need to enter?
Just fill in: date of birth, original due date. The result updates as you type.
Can you give an example?
Date of birth: 24 July 2026 → Age: 14 weeks + 2 days; In months: 3 months + 8 days.
Is this calculator free, and is my data private?
Yes. HOD Calc is completely free with no sign-up. The calculation runs in your browser: nothing you type is sent or stored.