Kitty biting

Question
My kitty is 5 months old.  Recently he has become VERY aggressive at times in his playing and attacks my ankles and hands and bites HARD.  What's the best way to stop this aggressive behavior?  I have noticied he has some new teeth coming in but it really hurts to have him jump on my bare ankles and bite them!  

Answer
Hi, if you ever see your cat do this give him/hem a ferm no if he still desides to do this get an empty windex bottle or enything that can spray and fill it with water and a few sqirts if lemon, and then when your cat does this again spray hi/her and this should work.THANKS!!!!