We have raised hundreds of chicks and I have not had many problems. But, we have a 6 week old chick that is about half the size if its siblings and still has most of its fluff and very few feathers. I see it eating and drinking and there is not evidence that it has been severely picked on. What could be wrong? A problem inside? Will it ever grow? We have separated it now into its own coop. Not sure what to do. There is no malformation of its beak. Any suggestions or ideas?