I hope that last one comes out for you..... I have helped mine before if the blood vessels are off the membrane. It could be it's little body is all twisted crazy and so it can't get its eggtooth against the shell to pip. Sometimes if their body positioning isn't right, they can't get to it. I wouldn't hold it against you if you helped that third little 'gal' out. I would open the other aircells up tonight to see what happened. I have never had a chick hatch after day 23. The other two are cuties though, I hope they are healthy fuzzballs!