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The oocyte and the sperm come together and the egg is inseminated. Within the first 24 hours, the egg divides for the first time; the fertilized ovum divides a few hours after fusion and continues to divide every 12-15 hours anew.

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Early embryo; yolk sack is feeding the baby.

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At 25 days the fetus's heart chamber is developing; at 32 arms and hands start developing, and by 36 days you can see the beginning of primitive vertebrae. Within these weeks the fetus goes through their most rapid development. By 45 days the fetus's heart is beating twice as fast as the mom's. Around 52 days begins the development of the fetus's retinas, nose, and fingers.

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Between these weeks the fetus begins to resemble a little human being. At 12 weeks, it is not yet determined whether or not the baby will be born a girl or a boy. Throughout these weeks continuous movement in the womb is necessary for the fetus for strong muscular and skeletal growth.

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Development of the fetus is complete by 8 months. Weight gain will continue until the baby is born.

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The Expulsion Stage is when the baby moves down through the birth canal and is born. The baby's head is the first out, then the shoulders, followed by the remainder of the body. Some situations require a baby to be born via C-section.