Not sure if I should be doing something proactive about this or ignore it as just a phase he will grow out of? He is not doing it out of anger or frustration but will bite my cheek/chin when I am cuddling him, and he also does it when playing with other children. He doesn't bite hard but now he has 4 teeth it definately hurts! I say OW when he does it, which usually makes him cry...any thoughts?