F.A.S.

Once a fetus' brain is formed in the womb, it's done developing (basically). All the building blocks it's going to receive are there.

Nutrition during childhood, loving parents, stimulus, exercise, thinking about goals, etc are important after birth in shaping personality, but not IQ.

Your IQ at birth, which we don't understand how to measure, is your IQ throughout your life (basically).

If the mother carrying that baby drinks and/or drugs enough while the fetus is attached to her womb for the nine months of pregnancy (quantities of alcohol and other drugs and their effects on a fetus are not yet understood) that fetus will be born brain damaged and there ain't a damn thing doctors or anyone else can do about it.

FAS babies often, quite often, grow up to be 100% disabled. They eat, shit, sleep, and, often, fuck.

Can a FAS adult female give birth to a healthy baby? That also is not understood, but my gut says "yes, they can", though the raising of an otherwise healthy baby by a FAS parent will always (ALWAYS) be a disaster for that child.

This is one big fucking problem in America.