I have three chicks, they're just about 3-and-a-half weeks old. The 2 sussex are doing great, they're active and doing well (Today I watched one of them chase a bit of down around the brooder around and around). The welsummer, however, is worrying me. I came home from work today and she was just sitting there quiet, head close to her body. I picked her up to examine her and she did not try to run away, just let me pick her up, which is unusual. She seemed fine, felt warm, does not have pasty butt, but is quiet and seems a bit slow. I put her back in the brooder and she climbed up on the perch and put her head on her wing and went to sleep. She slept for a while, then walked around quiet, not doing much. Brooder temp is 79-80F, plenty of clean water and feed, and like I said, the other two are just fine. The welsummer is usually the most active of my 3, which is why it stands out. She's not exactly lethargic, but not exactly active. I just watched her peck at some feed just like the others, then she went back to sleep. Is this something I should be worried about or is this ok? Will she return to her 'normal' self? These are my first chickens, so I truly don't know what to expect. Any ideas?