MY SISTERS BOYFRIEND SMOKES ALOT OF WEED

My sisters boyfriend is a pothead. He's one of those wake and bake guys. She's pregnant. Due in July. He still smokes...I thought he'd stop because she was pregnant but no...I remember he sat next to me during the superbowl game he smelled like he had just smoked. Anyway...I was wondering if it will affect the baby...like its genes or anything like that. My dumb ass sister didn't even know she was pregnant till she was almost 4 months pregnant. So I'm sure she's been around the smoke too.