How will i know if my child has a milk sensitivity?

Several clues:: Diarrhea (especially bloody), constipation, pain/crying, rash, vomiting, and failure to gain weight are all possible clues to a milk sensitivity. The best test is to stop all dairy and soy (up to 50% cross-reactivity) products; if this takes care of the problem, you have your answer.

Diarrhea, skin,nose : Milk sensitivity can be an allergy which can cause a variety of symptoms including a skin rash, vomiting, diarrhea, or even a runny/stuffy nose or ear infections. Milk sensitivity can be caused by the inability to digest the milk sugar lactose which causes only intestinal symptoms like diarrhea.

Rash: I assume you mean actual milk or milk-formula since breastmilk sensitivity is much rarer (and is due to foods in the mother's diet). Symptoms of milk allergy include rash, vomiting, diarrhea, cough/wheezing/shortness of breath, worsening eczema. Many children only have the rash. Milk protein intolerance is a different type of reaction to milk which usually presents with bloody diarrhea.

Abdominal discomfort: Milk sensitivity is different than milk allergy. The most likely cause is difficulty digesting some of the milk proteins or an inability to fully digest milk sugar. In either event this can cause abdominal discomfort and in the case of lactose intolerance bloating and diarrhea.

Milk sensitivity: The exact underlying mechanism for food protein-induced enterocolitis syndrome (fpies) is unknown, whereas allergic antibody ige-induced cow milk allergy and lactose-intolerance are easily diagnosed problems that similarly cause milk intolerance. You might want to consult a pedi gastroenterologist to help you sort out these confusing issues.

Allergy vs enteropat: Check ige to milk via skin or blood. Protein losing enteropathy more challenging in infants.Need clinical and historical presentation.