Any birth which occurs fewer than 35 weeks after conception is considered to be preterm.
Premature birth. labor pains occur between the 20th week of pregnancy and her 37th week. the onset of regular contractions with progressive dilation and closure of the cervix before 37 weeks of gestation is completed.
The process of prenatal development occurs in three main stages. The 2 weeks after conception is called the germination period, the 3rd to 8th week is called the embryonic period, and the 9th week to delivery is called the fetal period.
A fetus is a prenatal human being between the embryonic period and birth. the fetal period lasts from the beginning of the 9th week after fertilization to the average delivery time, which is about 38 weeks after fertilization. the fetal period lasts about 30 weeks in total.
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