Need to turn your baby’s age in weeks into months, fast? This simple converter does it instantly. Type in the number of weeks and you will see the age in months right away, with no counting on your fingers. It is perfect for answering family questions, filling in forms, checking clothing sizes or just keeping track as your baby grows.
Weeks to Months Converter
Weeks to months chart for babies
| Weeks | Months (approx) |
|---|---|
| 4 weeks | 0.9 months |
| 8 weeks | 1.8 months |
| 12 weeks | 2.8 months |
| 16 weeks | 3.7 months |
| 20 weeks | 4.6 months |
| 24 weeks | 5.5 months |
| 28 weeks | 6.4 months |
| 32 weeks | 7.4 months |
| 36 weeks | 8.3 months |
| 40 weeks | 9.2 months |
| 44 weeks | 10.1 months |
| 48 weeks | 11.0 months |
| 52 weeks | 12.0 months (1 year) |
Please note: because calendar months are slightly longer than 4 weeks, these figures are close approximations. For an exact age in years, months and days worked out from an actual date of birth, use our Baby Age Calculator. If you would like the full explanation of how weeks and months line up, read our guide How Old Is My Baby in Months?, and follow your baby’s growth on our Baby Growth Chart page.
Frequently asked questions
How many weeks are in a month?
On average there are 4.345 weeks in a calendar month. A year has about 52.18 weeks and 12 months, and dividing one by the other gives roughly 4.35 weeks per month, which is why a month is a little longer than exactly 4 weeks.
Is 24 weeks 6 months?
Not exactly. 24 weeks is about 5.5 calendar months, because calendar months average 4.345 weeks rather than 4. Many people still count 24 weeks as 6 months using simple 4-week months, but the exact calendar answer is closer to five and a half months.
How do I convert weeks pregnant vs baby age weeks?
The maths is exactly the same. Whether the weeks describe a pregnancy or a baby age after birth, you convert weeks to months by dividing by 4.345, the average number of weeks in a calendar month. Only the starting point differs — a due date for pregnancy, or a date of birth for a baby.
Disclaimer: This converter is for general information only and is not medical advice. If you have concerns about your baby’s growth or development, talk to your pediatrician.