I received 12 Silver Sebright eggs. 3 of them hatched normally. 2 had were not able to hatch on their own - after 30-36 from when they pecked the first hole through their shell. I assisted these 2 in hatching but breaking the shell for them. They seemed to be glued strongly to the shell. One was small and seemed to have deformed feet which corrected over time. I left the other 7 eggs in the bater for an additional week and observed no more signs of hatching. Today I took the eggs out and cracked two to see if they were fertile. Both had little chicks in them that were fairly well developed but still had some yolk. The little chicks didn't move or show any signs of life. It seems odd that they would make it that far but not hatch. This is my 5th time using the bater and I still have a lot to learn. I'm posting this to see if this is normal or if there is something I can do to help more chicks hatch.