I'm a carrier and my husband tested negative, but I'm concerned anyway. We have an 11-month old daughter who's always been low on the growth percentiles and suddenly got a rattling cough without having had a cold. Her pediatrician said wait and see if the cough goes away in a week before doing any testing. My question has to do with the greasy poop symptom, since that is one that my daughter has not had. Are greasy poops always present in CF babies?