I have 3 Silkie chicks (I feel like 2 are male, and one is female). The one that is a female appears to have stopped growing... she is considerably smaller then the other 2, as well as the other breed chicks that are the same age. She is also becoming SIGNIFICANTLY friendlier and docile, as she used to be fairly flighty. Is this normal? Could she be sick? She is eating, drinking and moving around just fine. She has just stopped growing.... I can pick her up with one hand, where as the others I need to hands and can hardly wrap around them. This is something I have noticed now for the past 2 weeks and she doesn't seem to be declining in health.. just not growing anymore, and like I said, very, very calm.... Thoughts? Should I worry?