During a woman's menstrual cycle, eggs from her ovary may be fertilized in the fallopian tubes by sperm from a man. Normally this is done through sexual intercourse but may also be done artificially. Once the egg is fertilized, the combined cell will begin to divide to form a blastocyst. This travels from the fallopian tube to the uterus (womb), where it implants on the uterine wall. Here it can develop into the fetus. In some cases, more than one egg may be fertilized and implant (fraternal twins), or an egg may divide after fertilization (identical twins, triplets, or more). The fetus will develop more and more of its specialized systems and organs, receiving nutrients and oxygen through its umbilical cord. About 38 weeks after conception, the uterus begins the contractions that will push the fetus from the vaginal opening, which is childbirth.
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