Fetal development
After implantation, some cells become the placenta while others become the embryo. About three weeks after ovulation, the baby's brain, spinal cord, heart, and others organs begin to form. The heart begins beating during week five. During week seven, the umbilical cord appears. At the eighth week the developing baby, now called a fetus, is well over 1/2 of an inch long -- and growing. A ‘full term’ delivery generally occurs around 40 weeks.
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