Babycat milk digestive problems

<p>I have used Royal Canin Babycat milk for many years. I now have a problem with runny stools with my current kittens (6). Bottle feeding started when they were 6 days old. They are now 3 weeks and I just lost 1 kitten. I changed to a different brand of baby cat milk and the kittens are doing much better (stool color and consistency have improved as well)</p>