“Seems like a legitimate concern. The Child is certainly injured by such indulgence.”
The child is likewise injured when a mother is obese, or takes medication, or listens to super loud music at concerts. I can think of loads of things that might injure a fetus. Should we all be concerned about that too?
Obesity causes birth defects? Injures a child's body?
Don't think so.
or takes medication,
Absolutely, and no such medication should be taken without the approval of a doctor, i.e. someone with the knowledge necessary to ascertain the probabilities and risk of injury to the child.
listens to super loud music at concerts.
Don't think so. Loud music won't cause birth defects or cognitive impairment, at least not as a fetus.
I can think of loads of things that might injure a fetus.
Apparently you can't. You thought of one, and it is of the same nature as the nicotine danger; Drugs introduced into the system which are harmful to the child.