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Conception/Fertilization: A new, unique human life begins when sperm and ovum join to form a single cell.
Implantation: On about the sixth day, the growing child attaches to the wall of the mother's uterus and begins sending out the "all systems go" chemical signal that can be detected in a home pregnancy test. Before the second week is over, the cells of the child's small body will have already begun segregating themselves into the layers which will give rise to the brain, nervous system, skin, digestive system, muscles, bones, and circulatory system.
3-4 Weeks: The baby's heart begins its first halting beats as early as 18 days after fertilization, often before the mother even suspects she is pregnant. The child ...