How can I figure out if my baby has a food intolerance?

If you suspect a specific food is causing stomach discomfort or vomiting, the most effective method is an elimination diet. Remove the suspected food completely for at least 14 days and monitor for symptoms. If the issues resolve, slowly reintroduce it later to confirm. Always keep a food diary to track timing and symptoms, and consult a pediatrician to rule out more serious conditions if vomiting is frequent or severe.