It depends on how serious it is. Labor puts stress on your heart and if your doctor thinks your heart cant handle it he will likely schedule a cesarean. But dont worry to much until he tells you for sure what he thinks you should do. I hada cesarean with my first and it really wasnt that bad plus there are lots of books in the pregnancy section of the book store on cesareans. I think everyone should read one just in case. My little sister hada heart murmur for the first couple months of her life but it healed itself the doctors thought it was because she wasnt sqeezed thru the birth canal to squeeze it together so I guess its fairly common in c-section babies (macy didnt have aproblem tho) but ne ways she is 3 now and just fine.