I know this is an old thread but I just went through the same horrible experience as the OP. My chick was born later than the rest, at 23 days, was a Silkie and was incubated in a bator that I have since thrown out due to its continued inability to keep consistent temps. She was born as what appeared normal. But even after 4 days never looked any bigger. She began to stammer around at day 2ish and it got progressively worse from there. My husband put her down this evening, at day 5. I'm wondering if the temp fluctuations (93-106) could have played a roll in this happening. On a side note one other chick in this hatch had curled toes and with shoes she started to get better until the progression of falling over got worse. I gook off the shoes at day 4 and while her toes were straight, she couldn't walk. The 3rd fatality was one born with splayed leg. We put the hobbies on him and same damn thing happened. He began to get better for a few days then progressively went downhill. These 3 were all from my buff hen so wondering if it's genetics or again the faulty bator. This is my first go round with this hen. Food being fed is of very high value and appropriately balanced. With the addition of black oil sunflower seeds, meal worms, greens, suet cakes and kitchen scraps. So I do not think it is a nutritional issue. Any other ideas?