Baby age, week by week
6 Weeks Old — How Many Months?
A 6-week-old baby is 42 days old — about 1 month and 12 days.
This week
The first real social smiles arrive for many babies this week. Worth the wait.
The math
6 weeks = 42 days ≈ 1 month + 12 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 6
At 6 weeks your baby is near the 1 Month mark. Around this age, many babies:
- Lifts their head for a moment during tummy time (always stay close)
- Knows your voice and likes it more than any other
- Their first real smile may show up between 4 and 8 weeks