I sure hope not... I have them in my car and they are louder then most guys i know and my fiance has some in his car and his are the loudest thing i have heard in my life ha but we thought about it and its just air and the baby is in your wifes tummy anyway with all the amniotic fluid that the baby should be okay as long as you dont abuse it and keep it down. We had two in his car and took one out. Also his mother played bass guitar at bars all the time when she was prego with him and she always said he will end up either loving base or hating it and of couse he loves it ha so maybe your kid will end up loving it once he or she is here.