Effect of Drugs on Baby?

My son has autism... which is commonly "co-morbid" with drug exposure. He also has SEVERE ADHD, also very common with stimulant addicted kids. When I say severe I mean he make a 'typically' presenting child with adhd seem calm, still and attentive. SEVERE! My son's diet during his unborn months was a steady stream of cocaine... with other things mixed it.