If you believe that Jesus died sinless in order to be the perfect sacrifice, then I argue that he could never have sinned.
Born the human embodiment of a god incapable of sin, he would have to know right from wrong immediately. He could never disobey his parents from the moment of his birth never tell his mother "no!" like all other infants do, never throw a tantrum nor be fussy and cry for no reason. Probably didn't cry even as he was being delivered in the manger.
After all the restrictions about cleanliness before entering into the inner temple and no blemishes aloud on humans or animals, I argue he could never poop himself. It just makes sense that god would never sit around in his own feces.
But without the ability to fuss when hungry or when he needed to boom boom, how did he communicate his baby needs? I argue that he must have been able to talk. Fully formed thoughts and sentences, just like Adam and Eve, perfectly expressing himself so that he wouldn't starve nor soil the ground that was made holy by the fact that he was sitting on it.