Lid or no lid after cutting/pipping?

[coldbloodaddict]

So we have a clutch pipping any day and we wonder what to do once they start sticking their head out?We can't find this info anywhere, so here goes:In the incubator, do you keep the lid on the box until all the babies are out of the egg? Can they breath that way? We have two air holes in the box, Brian Gundy style

I keep the lid on...I also have 2 small air holes in the egg box.