Spit up alone does not indicate allergy to me. It can be A sign of an allergy yes. But alone no. Spit up to a certain extent is normal. I wouldn't recommend cutting out dairy on a whim. It's tough. You have to cut out ALL dairy including hidden dairy and traces of for 2 weeks + before you can be sure that it is making a difference. If there are other signs of an allergy then I would recommend that the OP see an allergist.