Hey there-
My son is 8 weeks old and was diagnosed at 10 days. I am breastfeeding him and he is doing wonderfully. He gains about 10 ozs a week. Of course he is taking the enzymes, zantac and vitamins as well. I just started giving him 2 bottles of formula a day (Similac Advance) and still breatfeeding all the other feedings. I hope this helps!