It’s just to keep them warmIt’s impossible to tell. How old did they say they were when you got them?
ETA: is that straw in the first photo? If so, they shouldn’t be bedded on or fed straw.
It’s just to keep them warm
Do they live outside? You could get some heat pads for extra warmth. But, as above, they shouldn’t have straw in their cage at all.It’s just to keep them warm