Touching the head😂

Me an my boyfriend are talking an we joke around a lot an he says "suck my dick" so I said I would but only if it would lead to sex. I kid you not he looks at me with a straight face an says I don't want to poke the baby in the head you did say the doctor said his head is down there. I couldn't help but laugh because I've been trying to figure out why aren't we having sex anymore an now I know I did tell him he wasn't going to hit the baby but he just seems so worried that he will. Should I tell him his dick isn't that big to even cause me to have labor like he has a average size I just don't want it to come out mean or anything.