I just hatched silkie bantam mix in the incubator. The eggs are from my own chickens. I have 1 blue silkie roo and the following hens,1 buff silkie, 2 white silkie mix, 1 black silkie mix and 1 black frizzle. All are 12 - 14 months old. They hatched late on the 21st day (yesterday). I started with 21 eggs that I collected over 5-6 days. They were laying more than usual that week. All but 2 eggs showed fertility when I candled them on day 4 or 5, by lockdown I had 8. Oh the 8, 4 are fluffy and in the brooder, 2 of those do not stand normal. Their legs are off to the side like they are doing the splits the hard way and they just kind of drag themselves along. 1 is laying still and not fluffy in the bator. Drinks water off the tip of my finger but not getting up. Those that did not survive, 1 had a vaulted or crested "bump" on its head that was much larger than its head and one closed eyelid on the right side. Another was normal length but very narrow... not skinny boney just narrow small frame, very long neck close to the length of the body and flat head. The last did not hatch. Does anyone know what could cause this many issues? Or is something like this more common than I think? I can't stop wondering if I did something wrong... or if something is wrong in my coop. I have fresh layer feed down always, scratch in the afternoon, grit sprinkled once or twice a month, electrolytes/vitamins about every 3 weeks. Insulated draft free coop with straw and pine shavings. I pick up poop every day. They have a big outdoor run with a dirt, screening and straw floor. What the heck is going on?? I just dont see how all these problems happen in one hatch. I didnt take pictures of the chicks that died, at the time I thought it was morbid after some research here i regret not taking any, I see that could have been helpful. I am adding pics of the legs and the one still in the bator. All but 1 have this bump on their head, different sizes though. Is this whats called a vaulted skull? Normal?