Life Before Birth (Pack Of 25)

Conception: Life begins!Life begins at conception as a single, separate, living cell. Nothing new is added except oxygen and nutrition. Fertilization occurs when a sperm and ovum join to form a single cell, full of life and bearing the unique genetic imprint of a person who has never existed before. The DNA in the 46 chromosomes of that small cell contain full instructions about that new individual?s sex, eye color, foot size, brain capacity, and other physical traits.1 week: ImplantationOn about the sixth day, the growing baby attaches to the wall of the mother?s uterus. That rich nutrient lining welcomes the tiny tenant, and soon the child is sending out the chemical signal that can be detected in a home pregnancy test. Before the second week is over, the cells of the child?s body will have already begun segregating themselves into the various layers that will give rise to the brain, nervous system, skin, digestive system, muscles, bones, and circulatory system3-4 weeks: A beating heartThe baby?s heart begins its first beats as early as 18 days after fertilization, often before the mother even suspects she is pregnant. Between the third and fourth weeks, the baby?s head and spinal column become easily distinguishable, and arm buds appear. Legs will begin to appear days later. The umbilical cord forms, transporting oxygen and nutrients to the child.6 weeks: Brain wavesFingers are forming, and the child?s mouth and lips are apparent. The child begins his or her first movem