This is not my first time hatching incubated ducks but it's my first time with a problem. They are on day 30 today, they pipped early morning yesterday and last night some time. They made no progress. I helped by peeling the shell back just a little so they could push their bill out and progress. It worked but they are very dry. The humidity is at 90% too. I put wet towels in there and placed them next to them so it could moisten them up. It's working and they are making progress BUT it looks like maybe they didnt develop all the way. They have a big ball out of them where the umbilical cord is. Will this go back in by itself? One looks like it's shrinking back in the other two not. They still have the cord attached to the membrane/shell and they are starting to move around. Is there help for them? I have never experienced this before. I have helped chicks hatch and one duck but never saw anything like this! Thanks!!