Girls ?, today my son had a protruding tongue all day. His grandmother…

Girls ?, today my son had a protruding tongue all day. His grandmother started saying that it's not normal, that something is bothering him, fleas. I don't pay attention because he's a child, what's there to be concerned about. Am I right? Especially since he bites everything and drools. He also doesn't allow him to suck his fist, but I allow him to suck his thumb recently learned, after all, there's his own hand ?