How often dose a 4 week old kitten go poop?

Like many mammals, infants need their anus stimulated in order to urinate or defecate for the first few weeks. Usually their moms do this for them by licking it. If there is no mother present, and you are unwilling do to this; my suggestion is to get a cotton ball and soak it in warm water, and use it to wipe the kitten bum from front to back a few times. That should do't.