Answer:
The contractions push the head of the fetus against the cervix at the lower end of the uterus. The cervix dilates. In the second stage, expulsion, powerful contractions push the head and the rest of the body through the dilated cervix, and out through the vagina and the vulva. The baby is born.
Step-by-step explanation:
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(also, you gotta have sex or talk to the doc to get pregnant)