Looking to buy a duvet (150 x 120 cm type) for DS. He's in a junior (cot) bed. What sort of weight / tog duvet is appropriate for him? There seems to be a few 4 or 4.5 tog ones out there and then a leap up to 9 tog. His room is never freezing cold and I suspect that the 9 tog one would spend more time kicked off that actually one, rendering him cold most of the time. Ideas, people? Cheers!