I am incubating eggs and there is only 1 left (2 of the others were infertile and one died during the incubation period). It is the end of day 23 and when I candled I saw movement on the side of the air bubble- so the chick is definitely still alive. I know it has to break through the inner membrane in order to break the shell, but the movement at the side of the bubble has been going on for at least 4 hours and the chick has not managed to get the beak through the inner membrane in order to breathe. Should I break the shell above the air bubble and make a small hole in the membrane where the beak is, in order for the chick to breathe? or should I just leave it to get through on its own? I know it's risky to interfere, but I don't what the chick to suffocate. How long can I leave it like that before doing something? Thanks!