I have followed EVERY thing I was supposed to do with this incubator and my first chick hatched on day 18 with no problems. The second chick was like 14 hours later with no problems. The 3rd, 4th, 5th and 6th hatched a few hours later and their navels are horrible. One looks like his guts are falling out. Is there anything to correct htis in the next chicks to hatch? Today is day 20 so I have quite a few left to hatch. Also, is there anything I can do for the ones already hatched with their navels looking so bad??? Thanks.