ok jan was posting while I was! this formula is super! the kittens love it (and all the cats in the house smell it and want some too), they get fat and healthy and devour it. The biggest trick for me has been those bottles! cut the X on the tip but make sure its a clean cut, the rubber is thick. Also- if you push on the bottle, and too much goes into baby at once, it'll go into lungs and aspirate. so slow is good. once the kitten gets a sucking rythem , it's easy. keep us posted and send pics?