What happens if you feed a 4 week old kitten tuna?

Tuna should not be given to a 4-week-old kitten as it is not an appropriate food for their digestive system. Instead, 4-week-old kittens should be fed kitten formula or other foods specifically formulated for their age. Feeding tuna to a 4-week-old kitten can lead to a number of health issues including dehydration, malnutrition and digestive upset.