Why do baby's get sick

OK . . . now I know why baby's get sick but it is a lot of stress not just for the baby but for the parents too. Bree came down with the cold last weekend after I finished putting up the new crib in her room. We had to take her into the emergency room at one point because her temperature would not go down. She was fine and it was probably more of her parents over reacting then her actually being in danger but we are new at this and I feel we have that right to do that still. Anyways . . . she has a serious cough but other then that she has been acting her normal self. I am glad because it is not easy being a cool and collective mom when your child is sick.