Isn't it time for tortoises to hibernate. If it's only a baby you might have to keep it indoors in the warmth and keep it awake, as it is unlikely to have put on enough weight to hibernate. Next winter, I would suggest you contact a vet to get it weighed to see if it is heavy enough to hibernate. If it is by then, it should sleep in a hay lined sturdy box, in a cool place, but not where frost can get at it. You will need to check on it from time to time, as they can wake up if the weather turns warmer, but they usually wake up in the Spring. Hope all goes well.