My DS is 5mo and he has had the same experiences with feeding. It has gotten so bad though that he would only eat while sleeping in the car in his car seat. I would have to pump and get him ready 6 times aday. This has been so hard on us. My pediatrician initially did not think it was allergies either and ... with all due respect, i feel like GP's are generally under educated in the field of allergies. Even after we saw mucusy poop and then bloody poop - our doc said "oh allergies are so rare." He treated for acid reflux for 3months - no help. Finally we went to a GI specialist - my DS has allergies - so far we know Milk, soy, wheat, fish ... and either pumpkin or apple(sauce)? It happens. Even if there isn't blood in the diapers - it still could be allergies, according to the GI specialist I see. This pattern of feeding is not normal and it can lead to a distrust or even feeding aversions if the LO is in pain from either reflux or allergies. Also, i have learned that when there is a milk protein allergy, about 50% of the time there is a soy allergy too. I currently am only eating turkey, rice, and yellow squash. that's it. My DS is improving significantly. Due to his lack of nursing at the breast - I have to supplement him with an amino acid based formula, there are 3 of them and they are like mirical formula! Nutramigen AA (Great), Neocate (good), or elecare (not so good) all 3 can be purchased and ordered through your local pharmacy w/o prescription - but they are expensive. It takes up to 2weeks for the milk protein to leave your system and then an additional 2 weeks to leave your LO's system. It can take a while to see huge improvements. My doctor suggested we stop breast feeding for 3 months, but as long as I can stick to this strict elimination diet - I am continuing to bf. -
It may not be allergies in you case and it could just be a more severe form of reflux - but get a second opinion... gp's really aren't that good in this area in my experience. If it wasn't for the intervention of the GI specialist my DS may have given up on eating all together - it's nothing to mess around with!! it could really lead to some bad feeding habits or aversions. Good luck.