Just Born Kitten Formula is definitely one of the best
I have been a Ragdoll cat breeder for 14 years, and have had plenty of opportunities for supplemental feedings (fostering babies for my local shelter, or supplementing mothers whose milk supplies are inadequate or who cannot nurse due to abdominal surgery, for instance). I've used several products for this purpose, and I definitely prefer Just Born for supplemental feedings for my kittens. They seem to prefer it to other products; it is easy to digest and causes few digestive upsets, and is apparently quite tasty. I like it myself because of the lack of digestive issues further down the road when the kittens reach adulthood (I've seen IBS and IBD quite frequently in kittens I've fed with one of the most common kitten milk replacement formulas out there). When Petco stopped carrying Just Born, I went looking for it online. It's WELL worth the extra shipping costs.