Under normal circumstances, the entire childbirth process for a fetus is divided into three stages: early pregnancy, middle pregnancy, and late pregnancy. Generally, fetal development between 28 to 40 weeks is considered a viable period. During this time, if delivery occurs, the baby's chances of survival are very high. However, normally, a fetus between 37 to 40 weeks is considered full-term, so babies born before 37 weeks are referred to as premature. Premature babies need close monitoring of their developmental status after a normal delivery to avoid potential complications.