Don't get me started on epigenetics. Some studies postulate that a woman that smokes while she is pregnant can cause epigenetics changes the persist 7 generations later. They done some cool studies on mice with epigenetics and environmental changes but I don't remember them well enough to quote here.It sounds like a pregnant mother. Whatever she puts in her body, transfers over to baby. If that is a drug, baby is affected even after being born. DNA could have been damaged which can then continue to following generations. Might be a stretch but thats how I think of it
For anyone wondering what epigenetics are;
Your dna is basically a blueprint within this blueprint some things are essentially guaranteed. IE two people with a dominant gene for brown hair will virtually always create a brown haired child. But within this blueprint exists variables that can be changed or altered based on environmental conditions and such. It's pretty cool stuff.