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January 1st - Week One
The life of a child begins when sperm fertilizes the egg. This is the stage the baby consists of a ball of about 100 cells. Only a few of the cells from inside the ball form the embryo, and the cells on the outside wall form the placenta. This is the stage implantation occurs at this stage. -
January 8th - Week Two
In this stage, the embryo consists of about 150 cells arranged in three layers - 1. endoderm 2. mesoderm 3. ectoderm - These layers form the muscles, bones, circulatory, reproductive, urinary, and nervous systems as well as the outer layer of the skin. -
January 15th - Week 3
In this stage, the embryo is now firmly attached to the uterus by the developing placenta. The brain and the spinal cord then begin to form. The thyroid gland begins to develop and a simple tubular heart is then formed and circulates blood. -
January 22nd - Week 4
This stage, little buds are beginning to develop, which will form the arms and legs. Then, the heart will begin to beat.