How To Sex A Kitten At 3 Weeks?

what is a good over the counter flea control for cats? what should i feed my kitten to get rid of worms? how do you have a litter box in your house so they don’t smell it up when pooping which is better cat food or dog food, and there are other questions besides these. what would happen if you cut off the head of a kitten? does an adult cat eat kittens?