How to Make babies Genetics

in the process of making a baby two separate cells join together to create a complex process that makes up every one of us. one of these cells is called a sperm, the other is an egg the both must work together to  make what we would call a baby. When they start this the egg must allow just one sperm in. Once that happens they began to split into separate cells taking twenty three  cells to both sides, then the two cells split in two again.