Growth

A baby is a very young person. Babies are small and helpless, and can't walk or talk. When babies get a little bit older, they move around by crawling on their hands and knees.

An embryo is a baby creature before it is born or hatched. Embryos either grow inside their mother's uterus, or in the case of a bird or other creature that lays eggs, the embryo grows inside an egg. After 2 months, a human embryo is named a fetus.

A teenager is someone aged between thirteen (13) and nineteen (19) inclusive. Teenagers are sometimes called adolescents. Teenagers are known for being rebellious as they grow up from children into adults.