You said your chicks are eating the same feed as your adults? What kind of feed are you feeding?
Can you answer a few questions, to better help us to help you? ....
1) What type of bird , age and weight.
2) What is the behavior, exactly.
3) Is there any bleeding, injury, broken bones or other sign of trauma.
4) What happened, if anything that you know of, that may have caused the situation.
5) What has the bird been eating and drinking, if at all.
6) How does the poop look? Normal? Bloody? Runny? etc.
7) What has been the treatment you have administered so far?
8 ) What is your intent as far as treatment? For example, do you want to treat completely yourself, or do you need help in stabilizing the bird til you can get to a vet?
9) If you have a picture of the wound or condition, please post it. It may help.
10) Describe the housing/bedding in use; size of area and number of birds there.
11) Have you checked for lice, mites? Have they been wormed?