So far my 2 yo sleeps in a cot (I’m in no rush to change this just yet) and he wears a vest, pjs, onesie type thing and he has a couple of light blankets which get thrown off shortly after he goes to bed. I have a duvet ready for him. I’m just wondering if I could get away with putting the duvet on him instead of the blankets as the weather is getting much colder now. What have others done?