Good grief! Having had 5 kids, I can attest to the fact that through the years, at least one of my kids had an unexplained cut on his tongue.
A cut on the tongue is a lot more suspicious on a toothless baby too young for crawling, falling or putting things in his mouth.
But once I sprained my son’s ankle by sitting him down too hard when he was capering around with his pants around his ankles instead of getting ready to go out.
I took him in to the doctor because I was afraid there was a break. Thank God the doctor did not file some inquiry on me.