So, I'm not sure...?

L has been biting my shoulders (or my husbands, or grandparents) when he gets picked up. It seems like he does it because he's excited?

I can't tell if this is a teething thing, or a behaviour thing, but I REALLY do not want to encourage this, but I am stumped as to how to stop it!

We don't play bite him at all, so I'm not really sure where he got this from?

Any suggestions, Please?