Jacks been in a 2.5 tog bag for a few weeks now. Room temperature is 22d. He also has a singlet and onsie underneath. No blankets as he moves all over the cot. He like to be warm. I also have a flanelette sheet as he loves the feel of it on his face. He mostly sleeps on his side or tummy. I know he is cold if he is on his tummy with his bum up.