Is my little boy stressed out?

[emmabailey]

Hello Coonie lovers!
Mufasa keeps biting his leg, Not hurting himself, but just nibbling on his leg. Normally when i stroke his belly. I don't understand why he does this, He has no reason to be stressed, He does not have fleas, he is eating well, going to the toilet is fine.
There is often kids in the house, they pick him up and i don't think he likes it much, But it doesn't seem to really bother him too much. I'm not too worried about it because he is not hurting himself
Anyone else's kitty do this?