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Baby's Development.
After the egg attaches to the uterus, some cells become the placenta while others become the embryo. The heart begins beating during week 5. The brain, spinal cord, heart, and other organs are beginning to form. At the eighth week the developing baby, now called a fetus, is well over a half-inch long -- and growing. A "full term" delivery generally happens around 40 weeks.

Prenatal development (from Latin natalis 'relating to birth') includes the development of the embryo and of the fetus during a viviparous animal's gestation. Prenatal development starts with fertilization, in the germinal stage of embryonic development, and continues in fetal development until birth.

In human pregnancy, prenatal development is also called antenatal development. The development of the human embryo follows fertilization, and continues as fetal development. By the end of the tenth week of gestational age the embryo has acquired its basic form and is referred to as a fetus. The next period is that of fetal development where many organs become fully developed. This fetal period is described both topically (by organ) and chronologically (by time) with major occurrences being listed by gestational age.

The very early stages of embryonic development are the same in all mammals, but later stages of development, and the length of gestation varies.

The process of prenatal development occurs in three main stages. The first two weeks after conception are known as the germinal stage, the third through the eighth week is known as the embryonic period, and the time from the ninth week until birth is known as the fetal period Within 24 hours after fertilization, the egg that will become the baby rapidly divides into many cells. By the eighth week of pregnancy, the baby will change names from an embryo to a fetus. There are about 40 weeks to a typical pregnancy. These weeks are divided into three trimesters. Learn about your baby’s development throughout each stage of pregnancy.

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