While many people understand the importance of ensuring the safe and correct development of a child in the womb, the psychological reasons behind this are not as widely known. During the germinal, embryonic, and fetal stages, a single cell develops into a zygote, an embryo, and finally a fetus before birth. To be born healthy, the fetus must be protected and withstand exposure to certain teratogens, depending on the mother's lifestyle. The first stage of prenatal development is the germinal stage. This phase begins when a sperm and an egg cell meet inside one of the fallopian tubes and lasts about two weeks until the cells attach to the wall of the uterus. Soon after, the fertilized egg, or zygote, begins to move toward the uterus. This zygote then begins to divide again and again, eventually forming two separate sets and 23 pairs of chromosomes. One of these groups will become the placenta, while the other group will become the embryo. If this process is changed in the slightest, it can lead to the development of twins. Subsequently, the cells will develop the blastocyst, which contains three layers known as the ectoderm, endoderm, and mesoderm. As the zygote becomes a human, the ectoderm will develop into the skin and nervous system, the endoderm will become the digestive and respiratory system, and the mesoderm will become the muscular and skeletal system. From here the zygote attaches to the uterine wall, where it will remain for the next nine months and receive nourishment. It is estimated that approximately 58% of naturally conceived zygotes never attach properly to the uterus (Cherry). development, many people may not realize the extent of growth and development that occurs before a child is even born. It seems essential that women trying to conceive are aware of all the risks they face which could have an effect on their baby before or at the beginning of pregnancy. The choices a woman makes during the prenatal phase can influence the child for years or often even for his entire life.