A little background--I received a shipment from a hatchery on Monday 1/26. Not sure of the birds had a rough trip but many perished after they arrived despite every effort I made, including hand feeding. I've never lost a chick after a shipment arrived so this was pretty devastating. Fast forward to today--of the surviving Polish, 1 chick is absolutely tiny. It was the same size as the others to start out but the others are growing and this one remains the size of a new hatchling. It's always eating, I also supplement with a yogurt, egg, chickstarter mash, and I also feed mashed hardboiled egg yolk daily. It eats and it's crop will fill mildly but never looks like the others (who look like they've swallowed a marble). It's active and its wing feathers are growing but it is not. Has anyone had experience with this? Any tips or advice are greatly appreciated.