I am pleased for you that one of the ‘babies’ has returned. The only worry is that it might have returned from hibernation early because it was not quite big enough in the first place. It will be a great help to it that you are providing food and water, but if you think it looks a bit small or a bit thin it might be worth checking with a local rehabilitator to make sure it weighs enough to continue to survive without additional help. Winter is far from over and we often get some very cold spells in February or later.
One late hoglet here decided not to hibernate, despite being big enough. Even so, she seems to have grown, despite it sometimes being a bit of a struggle to make sure someone else doesn’t eat all the food before she gets a chance!
Good luck with the little one there. I hope it grows to be a fine big adult hedgehog.