How can I stop a male cat from spraying indoors?
It ought to be several more weeks, at least, before your kitten is old enough to want to spray. At the first sign of spraying, or at about 4 1/2-5 months, whichever comes first, you should speak to your vet about getting the kitten neutered. If you neuter the kitten before he starts to spray he should never develop the habit.