What is the normal gestational age for a baby's birth?

A baby is normally born around 10 months, which is approximately 40 weeks.

The full gestational period is 40 weeks. Gestational age and due date can be calculated based on the last menstrual period or ovulation date. If the ovulation date is unknown or menstrual cycles are irregular, gestational age and estimated due date are determined from the first blood or urine test results and ultrasound measurements. After conception, a pregnancy reaching 37 weeks is considered full-term, as the baby is generally fully developed by this point. Birth before 37 weeks is classified as preterm, while delivery after 43 weeks is considered post-term. Typically, delivery between 37 and 42 weeks is considered normal. Therefore, it's normal for a baby to be born around 10 months of gestation.

It is also normal for a baby to be born up to two weeks earlier or later than the due date, as menstrual cycle lengths vary among women. For women with regular menstrual cycles, the due date is set at 40 weeks—about 9 months and 10 days. By this time, the baby has fully developed in the womb and will generally be healthy at birth.