So my twin 6 year old boys got a hen and rooster this summer and the hen just started laying eggs. My boys wanted to hatch them we collected the first 6 eggs and put them in the incubator. I wrote on all the eggs 1-6 and I left the incubator alone. 11 days later I went to candle the eggs, well my twins had been putting eggs in it the entire time. So to get on with the story I have many different stages of eggs in the incubator the first chicks hatched 3,4,5 and 8 hatched on 11/14, So I went to candle the rest found that 1,2,6,7 had died at some point and they were smelly and rotten. So today with how early 8 had hatched I thought I better candle the remaining eggs to see what stage there at. 9-12 appear to have a good air cell, so then I checked for cracks and tried water candling them, they all sunk to the bottom so I just waited for movement and thank goodness there was movement. I turned down the humidity in the incubator worried that they would drown as soon as they decided to internally pip, with how early 8 hatched I figured that 9 & 10 should be piping today assuming that kids wrote the correct number on the eggs. I'm worried that if the humidity doesn't get down far enough that 9 & 10 will drown when they pip. Besides what I have already done is there anything else I can do? Also eggs 13 and on up weren't fertile, the rooster and hen are only 20 weeks old these are their first eggs. Is that why one of the baby chicks has smaller head then the other chicks, it hatched before the others? Could it be a mentally disabled chick?