@dmariec2, Uggh. I can't stand it.. He does it with his nails too, and even if I clip them he'll dig his nails deeper.

My 3 month old does it all the time

Thank you @babynessa

I'd pinch him back not hard but a little pinch wont hurt. Or tell him no in a stern voice and tap his hand. It's what I did with my nephew he would bite his siblings and us so hard it would cause us to bleed. After a few taps he understood that biting hurt and it's not ok to bite. Of course he threw his fits when my sister and I would tap his hand but we would set him down let him throw his fit and walk away.

But he's only almost 7 months :(

pinch him back. I know it sounds mean but they will understand it hurts and stop doing it.