Hi Carrie my name is Heather and my son will be 8 weeks old on Friday the Dr's called me when he was 8 days old and told me they believed he had CF.We had no idea we were carriers either.My husband and I also have a daughter, 4 years old who we just found out doesn't have CF but is a carrier.I also have a son from a previous relationship he is 13,we have to find out if he is a carrier.I'm so glad to hear your little boy is doing wonderful and I hope his app. on Friday goes well.How much does your boy weigh and how many enzymes does he have to take? When you started the chest PT did you notice any mucus right away,we just started with the chest PT and he seems to cough more but there isn't any mucus.Are any of your other children carriers?