I am brooding chicks for the first time and I've had several issues. I have 11 chicks that will be 2 weeks old Monday. I was so focused on my 3 problem chicks, (who are now thriving), that I just today noticed one of my Barnevelders is skinny compared to the rest. She is active, eating, and drinking normally, and she is as tall as the rest. She just feels thin, and less feathered. Should I worry? Should I give her special food? Has anyone experienced this before?