For most organisms, you need a male who has the sperm (containing 1/2 the DNA from the father) and a female who has the eggs (containng 1/2 the DNA from the mother). The egg needs to be fertilized by the sperm. Different organisms have different methods to achieve this but for mammals, it’s done through sexual intercourse. After the egg and sperm combine in fertilization, there is a full set of DNA which instructs the cells to divide and form organs, muscles, etc. which grows into a baby. After it grows to almost full maturity, the female gives birth to the fetus.
Basically, an ovum (female sexual cell) and a spermatozoid (male sexual cell) combine and form an egg. That egg develops and divides and in due course, a baby is born.
For people, when a man and a woman get together and have sexual intercourse. The males sperm will fertilize the females egg in her uterus. Here the eggs cell can begin to divide and form into a baby. Once it has grown to a certain point in the females body it will be ready to leave and so the female will then give birth to the baby.
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