About to move DS1 (2.4) in to a bed. What tog duvet should I go for? I'm so used to him being in his 2.5 tog grobag on cold nights I worry he will totally overheat with a 10 tog duvet. Does anyone bother to buy 2 different weights of duvet for their LO - i.e 4 tog for summer and 10 tog for winter?