that's when it's most important to watch them for gut issues. Do you want to breed kits with gut issues? not really. But this seems a particular instance of a child making an error in judgment and the bunny recuperating from such error (that was made in abundance). If in the norm course of events you get a bunny going off feed...that bunny you don't breed. keep for a pet if so inclined...but not to use for breeding.
