Biting puppy !

I have a 3 month Pomapoo boy who enjoys jumping at me and biting me everywhere. The little scamp thinks its a game. I cant even pick him up without him biting me with those needle teeth. I cant even walk without him nipping at my heels and ankles. I have lil bite marks all over. Ugh ! Ive tried holding his muzzle and yelping. Ive tried distracting him with toys.No go, he still bites me. I cant wait for the biting phase to be over. Help please !!!