My chicks hatched yesterday and 1 barred rock was hatched out with its yolk sac still unabsorbed. it is still alive and trying to walk around in the incubator. then there are 2 rhode island reds that can't hold their heads up one's head is warped flat on one side it hatched like this and can't even lay on its belly it is on its side the other one is on its belly but cannot hold its head up, then there is a buff rock it was fine when put in the brooder now it keeps one leg out to the side. it can move it and everything and tries to walk but it is like its legs are spraddled. I gave poly vi sol to all 4 hoping it will help. but should I just cull them, and not make them suffer or work with them?