Some babies are born clean and some are dirty, which is related to the birth process and the turbidity of the amniotic fluid at the time of birth. Babies with a smooth birth process and clear amniotic fluid are clean, while babies with difficult births and contaminated amniotic fluid are dirty. Newborns are born clean because the birth process is smooth and the mother’s amniotic fluid is clean, clean amniotic fluid can stabilize the uterine temperature, giving the fetus a constant temperature living environment, to avoid infections, and at the same time to avoid fetal developmental delays or malformations, the baby is born cleaner. However, if there is a difficult labor, amniotic fluid contamination or intrauterine hypoxia and other abnormalities, it will lead to amniotic fluid mixed with meconium and other attached to the newborn’s body surface, so that the baby will be born dirty. It is recommended to drink plenty of warm water during pregnancy, eat more fruits and vegetables, and if conditions permit, do moderate exercise to help the eventual smooth delivery.