Milk and soy protein intolerance

Milk and soy contain proteins that may not be tolerated by everyone. Symptoms can include feeding difficulty, loose stools, vomiting, cramps, or [Bloating](/symptoms/bloating/). Lactose intolerance concerns the milk sugar lactose, not milk protein. An allergy involves an immune response and may cause hives, swelling, wheezing, or repeated vomiting. In babies, reflux, infection, constipation, or another feeding issue can look similar, so symptoms alone cannot confirm the cause.

Record the product, amount, timing, and symptoms, and show the record to a clinician. Do not remove both milk and soy without a replacement plan, particularly for an infant, because formula or breastmilk changes need professional guidance. A clinician may suggest a supervised elimination and reintroduction rather than repeated home experiments. [Food Intolerance Testing](/treatments/diagnostics-and-screening/food-intolerance-testing/) may be discussed when symptoms are persistent. [Nutrition Counselling](/treatments/lifestyle-and-wellness/nutrition-counselling/) can help maintain protein, calcium, and energy intake.

Seek emergency help for breathing difficulty, throat or facial swelling, widespread hives, unusual sleepiness, collapse, or repeated vomiting after milk or soy. Arrange prompt review for blood in stool, dehydration, poor feeding, ongoing [Diarrhoea](/symptoms/diarrhoea/), persistent [Abdominal Pain](/symptoms/abdominal-pain/), or poor weight gain. These signs need assessment rather than a broad self-directed restriction.

Ask whether the pattern suggests protein intolerance, lactose intolerance, or allergy; which foods need avoiding; what replacement is appropriate; and how reintroduction should be supervised.