Both before and after birth a babies growth is a direct result of the nutrition that it receives. A baby will grow healthy and strong if given the proper vitamins and nutrients.
When a sperm and an egg join together they form a zygote. This is what a baby originates as. A zygote is only one cell. A single cell grows/duplicates to multiple cells by the process of mitosis....
No but they can go under 12 months but sorry they dont grow but if your thinking about buying it i would buy it couse i bout this for myself im 7 but buy it if you can good game.