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Why do my 6-7 week old kittens have diarrhea after weaning food?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Mediumhair | Male | unneutered

Fostering 4 kittens. All about 6-7 weeks old. I switched them from kmr kitten formula to kmr 2nd step weaning food about 4 days ago. They all have diarrhea. I read that that can happen if you change their diet so I gave it a few days and it’s not better. I even changed the consistency of the food to make it thicker and it’s not helping. Also one kitten had a fecal test and was negative for parasites and worms. Vet said if one had it they all have it. Their behavior hasn’t changed, still playful.

1 Answer

Most Helpful Answer

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Answered By Amy S. Eutsey, DVM

Veterinarian

Published on May 7th, 2018

At the age of 6-7 weeks, these kittens are completely capable of eating dry kitten food. Perhaps this would help to regulate the stools and firm them up. You can do a combination of soft kitten food and the dry kibble.

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