If you used them, what age did you switch to a duvet?
We're going to buy our 2yo 'big boy' bedding today as recently he's been shouting at us to take his sleeping bag off at bedtime, last night we put a blanket on him instead and he was much happier so think it's time now. He turned 2 at the end of July and is thankfully still happy in his cot but I know we'll probably have to take the side off at some point soon as without a sleeping bag he'll probably try to climb out.
Just curious what age other people switched.