hope somebody can answer my questions:

- after a female cat give birth, when can she be neuter? have to wait how long?
- what is the best age for kitten to be spay/neuter?
- can i spay/neuter cat after vaccine?
- i heard they said, spay/neuter your cat when he/she is 100% healthy... what kind of healthy, is it like sick, or other desease like FIP/FIV/leukimia?