Ay, common yan sa babies kaya don't worry! Pag ganitong edad, palaging gusto nilang ilalagay sa bibig lahat, it's how they explore and learn about the world, lalo na pag lumalaki na ang teeth nila. A few of us mums noticed din na mas lalong tumataas ang oral fixation kapag teething or when they're bored, so try offering safe teething toys or clean wet cloth para may chewing outlet sila. That said, kung sobrang concern mo or kung nakikita mo na may unusual behavior pa, better to mention it sa pedia mo just to be sure, baka may reason din na kailangan i-address, like sensory needs or something else.