I have two 3 week old Australorp chicks that were hatched on October 13. One is growing/feathering quite well (chick 1), the other one has tiny wing feathers and most of its down(chick 2). She is the tiniest one of the group but is eating and drinking just fine. The rest of the chicks I got are growing and feathering out nicely, but this little chick just looks like a larger newborn. Any particular reason she is lagging behind? Chick 1 Chick 2 with nubs for wings!