How baby age is calculated
- Age in months and days: whole calendar months since the birth date, plus the remaining days.
- Age in weeks: total days since birth ÷ 7, with the leftover days.
- Corrected age (babies born before 37 weeks): chronological age - (40 weeks - weeks pregnant at birth). For example, a baby born at 32 weeks is 8 weeks early, so at 4 months old their corrected age is about 2 months.
Every baby develops at their own pace. Bring any questions about growth or milestones to your baby’s doctor or health visitor. For your own cycle after birth, the period calculator can help.
