Welcome, @sblausey . . . the squeaky leg may work itself out if EMO is brand new. Just keep an eye on it and if you still have issues after a while, report back here and we will do what we can to get you help.
Also, young voices are sometimes hard to understand for EMO. You can try submitting yours and your son’s voice to this page so that he can learn the vocal characteristics and be better at understanding you.