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However, you can know the stages of the birth process and what to generally expect. Childbirth usually occurs in three stages: First stage: The time of the onset of true labor until the cervix is completely dilated to 10 cm. Second stage: The period after the cervix is dilated to 10 cm until the baby is delivered.
A premature baby is one born before 37 weeks of gestation time. If a woman goes into labor before 37 weeks, it is referred to as preterm labor. In a typical pregnancy, delivery between 37 and 42 weeks is considered a full term, and anything after 42 weeks gestation is a post-term pregnancy. Causes MedlinePlus Medical Encyclopedia stresses that the cause of preterm labor is often unknown, but multiple pregnancies, of twins or more, make up about 15 percent of all premature births.