Kittens vomiting yellow water may be a sign of feline distemper or gastroenteritis. In this case, the kittens will vomit repeatedly and show symptoms of loss of appetite and lethargy. It is recommended that the owners send the kittens to the pet hospital for examination and treatment in time. treat. Kittens have weak immunity during their development period and are easily infected with viruses. Owners should pay more attention to the status of kittens to avoid deterioration of the condition and death of kittens.