Vomiting after a kitten eats something may be caused by indigestion, feline distemper, gastrointestinal disease, feline coronavirus, etc. You need to observe whether the kitten has other conditions. If the kitten appears to be in poor spirits, vomiting, diarrhea, and loss of appetite, In other cases, it may be a viral infection or gastrointestinal disease. It is best to send the pet to the pet hospital for examination immediately to confirm the condition and treat it in time. If there are no other symptoms, you can feed some probiotics to regulate the intestinal tract.