Doctors are not God! I did not use a pediatrician with my kids, just a regular family doctor. His opinion was.."you're the mom and spend way more time with this kid than I do, so you tell me what's happening and if I can't fix it within 2 or 3 trips, we'll find a specialist who can!" I loved that guy! My kids benefitted tremendously because he wasn't afraid to say "I don't know, but we'll find out". My kids ate cereal at one week..yes one..my son was a large baby and he liked to nurse pretty much non-stop and I felt like Elsie the cow! And I got no rest..yes I pumped and hubby got up, but I was still awake. My mom suggested I give him a little cereal at night and it worked, even though both the doc and I knew it wasn't giving him any nutrition (can't digest it). He was gaining fast the other 18-20 hours a day he was hanging on me!!
So..moral of the story..trust your mommy instincts, feel free to question your doctor and get a new one if you want. Or request (insist on) a referal to a specialist (maybe a pediatric gastro guy). You really do know how to take care of your child, it really bugs me when Dr's make you feel like you don't.
Its gonna be OK mom.
Mary