You should give your kitten proper diet. Moreover kittens are usually in the habit of playing. So your kitten is actually playing with you. But you can control it with a little training.

 Kitten that still have the need to suck on you or themselves usually have an emotional issue from being weened to soon. Most of the time this goes away as the kitten gets older. Try weening him/her from you by stopping hm/hr as soon as it starts. This may take awhile. Good luck!