I gav barley b4 it doesnt work... So I think it will b better if u dun bother giving anything!I think there isn't really a need to prevent it. After all a fever after a vaccine is just the body's reaction to it, perhaps an adjustment of some sort. It's a mild fever which can be treated with some baby panadol at home.
Besides, not all babies will get a fever after a vaccine. My daughter never had fever after her vaccines in her first year, only had fever once after her MMR jab.