These cochin bantams are almost 3 weeks old. The grey colored one is sooo tiny compared to the rest. I have taken pictures of it and of another one with a can of beans for comparison. Pictures really don't show the true difference in the size of the 2. Also, shouldn't they be feathered out a little more than they are? I have 2 more that do have more feathers that are the same age and they are a little larger. Is she/he just a runt or could there be something wrong? It has never been as frisky as the others. Just worried about it. Thanks for your help!