Weeks to Months

The first year, one week at a time. Tap your baby's week to see how many months that is and what's happening around that age.

Four weeks looks like a month. It is not. A month averages 30.44 days, so weeks divide by 4.345, not by 4. The gap is small at first and then it grows - by 52 weeks, dividing by 4 tells you 13 months, but your baby is just under 12.

That is why a 44-week-old is about 10 months, not 11, and why 52 weeks works out to 11 months and 29 days: one day short of the first birthday. For a number that matches your baby's real birthday - leap day and short months included - use the calculator instead.