Baby age, week by week
23 Weeks Old — How Many Months?
A 23-week-old baby is 161 days old — about 5 months and 9 days.
This week
Sitting needs less support, and some babies get shy with new faces.
The math
23 weeks = 161 days ≈ 5 months + 9 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 23
At 23 weeks your baby is near the 5 Months mark. Around this age, many babies:
- Sits alone for a moment or two
- Checks out toys with mouth, hands, and eyes
- Deeply attached to their favorite people