I have six week old silkie chicks that I feed FF and non medicated purina starter grower crumbles. This past week I noticed one of the chicks doing a head bobble. Kinda back and forth, side to side, every now and then. They had newspaper down in their room but I took all of that out because they were eating it. They keep finding scraps everywhere tho. I read that she could be doing it because she’s vitamin deficient. But I’ve only noticed one chick doing it so far. If she is vitamin deficient what would I give her to help with it? I hopefully posted a link to my YouTube with the video. The red light makes it a little hard to tell but it’s the movement of her head I’m worried about.