Birth is a miracle. From fertilization to birth and everything in between, a woman’s body is amazing. We can grow babies. With the help of genes, a pregnant woman can create a fully formed human in less than nine months. Those genes know what they are doing when they make an embryo develop into a boy or a girl.
A developing embryo doesn’t begin to differentiate into a boy or a girl until the seventh week of development; before this the embryo is referred to as bipotential. Though it is bipotential, the correct genes are already in place.