The majority of your brain's neurons were generated before you were born. However, after birth, some parts of the brain produce new neurons in a process known as postnatal neurogenesis.Infancy continues to add new neurons to a few places, including the cerebellum and prefrontal cortex. Furthermore, scientists believe that at least one brain region, the hippocampus, continues to generate new neurons throughout life.This part of the brain is involved in learning and memory, which is interesting.