Kittens with sensitive stomachs often experience digestive issues like vomiting, diarrhea, or gas when eating certain foods. Their tummies may react poorly to rich, fatty, or unfamiliar ingredients. It's important to feed them gentle, easily digestible diets formulated for sensitivity. High-quality kitten food with limited ingredients and no fillers or artificial additives works best. Always consult a vet to rule out allergies or underlying health problems.