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A female’s egg is fertilized by a male’s sperm in the fallopian tube. After fertilization, the egg divides and multiplies to form the embryo. During the next few days, the embryo moves through the fallopian tube to the lining of the uterus. There it implants and starts to grow.

During pregnancy, the lining of the female’s uterus thickens and its blood vessels enlarge to nourish the fetus. As pregnancy progresses, the uterus expands to make room for the growing embryo/fetus. The following pictures and drawings illustrate fetal development from 8 to 40 weeks.

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