Hello, I am new to chickens and to the forum. I have 4 chicks, all of them almost 3 weeks old. My Buff Orpington ("Blondie") has been lethargic for a few days. I treated all with Sulmed in case there was a cocci situation brewing, but everyone is healthy, eating and drinking. All are active, some more than others. Just this one is almost always down, in a corner or huddled next to another chick or two. The Brahma, who looks very healthy although she is the smallest, often sits with Blondie as if to keep her company. Blondie shows no other signs of illness: eyes clear and open, no discharge or foot problems. She doesn't wheeze or make strange sounds. She jumps and runs if I try to pick her up, but then they are all pretty skittish when we try to hold them. Is she OK? I looked back at video we took when they were two days old, and she was just as active as the others then. The difference in activity level now is pronounced. I would really appreciate feedback from experienced folks because I just don't know what to do. Should I accept that she's different, or intervene somehow? I thought of giving her some vitamin B but I understand I should not supplement until the Sulmed treatment is done. Thank you so much for your thoughts.