If this is worrying you, you should call your doctor's office and ask them. I think the biggest risks of listeria are miscarriage or early labor which would occur while you still have it so you don't have to worry about those. Yes, there is some risk that the baby could have been affected but I read a lot of women who have it their babies are just fine. I have never read that they can die 1-2 weeks after birth but again, if you are worrying about this, ask your doctor. Stress is no good and hopefully they can give you some peace of mind.