Baby age, week by week
43 Weeks Old — How Many Months?
A 43-week-old baby is 301 days old — about 9 months and 27 days.
This week
Ten months - cruising everywhere, opening cabinets, testing everything.
The math
43 weeks = 301 days ≈ 9 months + 27 days
A month is longer than 4 weeks — on average 30.44 days — so you can't just divide by 4. The exact answer shifts a little with the calendar, so for the day-perfect number, use the calculator with your baby's real birthday.
Get the exact age →What babies do around week 43
At 43 weeks your baby is near the 10 Months mark. Around this age, many babies:
- Stands alone for a few seconds
- Understands simple asks and follows along
- Waves bye-bye and claps hands