We bought a group of 10 baby chicks and they are aprox 5 weeks old at this point, possibly one or two is older based on the size. Anyway, one of the Australorps is just a little runt. She looks like she is a little bigger than when we first brought her home, but nothing in comparison to the other birds. She appears to eat and drink. Knows enough to huddle with the other birds when she gets cold and otherwise seems ok. We thought about pulling her out of the group, but decided we'd let things take their course until it is time to put them outside (hopefully in a week or two). Should I pull her from the group and hope she gets bigger or stay on the course and let the chips fall where they may?