I have a silkie chick who is about 8 weeks old, who was fine yesterday and this morning when I went out to check on everybody he(it) was laying down with its head tucked to its chest underneath of it. He was drinking this morning, and my husband said that he saw him eating this evening(crop feels empty). He is able to walk, although seems hesitant to do so, when he does, he tucks his chin to his throat. He has been eating non-medicated chick starter (16%) and grit. He has fresh water all the time. He is in with chicks the same size as him and they are all fine, so I thought maybe an injury? Any thoughts or suggestions would be great. Thanks in advance.