chewing?

Hannah • Hey my name is Hannah. I am a 27 yo SAHM 💙👶🏻 💙4/29/16 💙👶🏻 💙4/23/18
My son is 19 weeks old and he keeps chewing. I have checked his mouth and there is nothing in there he doesn't seem to be teething yet. Is this something I should be concerned about?