Comprehensive Calculator Guide
In the first months a baby's age is counted in weeks, then in months, because growth, feeding and vaccines change quickly. Enter the birth date to see the age today in weeks and days, in whole months and days, and in days. A baby born on 1 June 2026 is exactly 20 weeks old on 19 October 2026.
Weeks, months and corrected age
Weeks are the days divided by seven; months are whole calendar months from the birth date. Ages are usually given in weeks for about the first three months, then in months up to two years.
The Saudi basic vaccination schedule is set by age, at birth and then at two, four and six months and beyond; your primary care centre sets the actual dates. For premature babies, doctors may use the corrected age, counted from the due date.
How to Use
- 01Pick the date of birth.
- 02Leave the second date empty for today, or pick another date.
- 03Read the age in weeks, months and days.
Formula Used
Weeks = days ÷ 7 | Months = whole calendar months since birthPractical Examples
Example 1
Born 1 June 2026, on 19 October 2026: 20 weeks, or 4 months 18 days.
Example 2
Born 15 December 2025, on 19 October 2026: 44 weeks, or 10 months 4 days.
Important Tips
- Quote the age in weeks to the doctor in the first months.
Common Mistakes to Avoid
- Treating a month as four weeks.
Frequently Asked Questions
- How do I work out my baby's age in weeks?
- Divide the days since birth by seven.
- How many weeks is four months?
- About 17.
- What is corrected age?
- A premature baby's age counted from the due date.