A.H.
My son fell head first out of his crib at around the same age. Lucky for me we bought the type of crib where you can remove the side to create a toddler bed, which is what we did. That said, my son fell out of it the first few nights, but it was a short way down and we had put a comforter on the floor to cushion his falls. Eventually he figured out how to stay on the bed, and our life was much easier, especially when traveling since he could then sleep in any guest bed with no problems. He also never tried to leave his roon-- he knew he was not allowed. I would have put a gate up if I needed to but I never did. We did gate the top of the stairs near his room just in case. Good luck.