First Trimester: All organ systems begin to form, Nervous system begins forming, Heart begins beating, Embryo begins to move, Ears, eyelids, and teeth buds are formed, Unborn embryo is now called a fetus, Fertilization and implantation takes place, extraembryonic membranes form, Fingers and toes are now formed and have developed soft nails, Circulatory system and urinary system are now functioning, Can now suck its thumb, Second Trimester: Mostly growth, Fetal skeleton forms, Sex can be determined, Mother can feel the fetus moves, Fetus can now hear., Hair forms on the body (LANUGO), Taste buds are formed and may be able to savor the mother's meals, Third Trimester: Fetus turn into a head-down position., Fat is deposited beneath the skin, A greasy substance forms on the fetus skin., Lungs mature, Fetus can see light and react to sounds.,

Stages of Development

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