Poor baby. Honestly, i'd take another baby and keep company with him... i cannot explain why this happening but if it's drawing blood it's most definitely time to step in. The hard part is no one can say for sure the cause but i do know i let my mothers and clutches run with the main flock and this is not typical behavior and one i would again, as you have done step in to cease it immediately.
SHe can kill it and/or have serious injury with long term effects. she'll wean them so you can try reintroducing later but do so with caution. Best of luck.
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