gosh I am not sure of the name, but I think it is called "K/D"(or something/D) it is a specialty canned food with lots of calories, you should be able to find it at your vets office. I am surprised your vet didn't suggest it.
Years ago I had a kitten that was 10 weeks old when I got her and she only weighed 2 pounds, the vet told me to feed her that and it worked. be careful not to let any other cats eat it, it will pack on the pounds on them!
ask your vet about it.
good luck!
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