My giant 22 month old is already getting too big for his 18-36 month grobag, so I'm planning on making the change to a toddler duvet soon. I've got a couple of questions though - most toddler duvets seem to be around 4 tog, which would be really hot in a grobag, so are they suitable for this time of year? What do you use when The weather gets really hot / cold?
Also, I've seen some really nice quilts / coverlets. Are they just for cot decoration or do you use them instead of a duvet? Are they generally thicker or thinner than a duvet? Feeling a bit confused with all the options, lol! 
Finally, my ds isn't a huge wriggler but he does change position a couple of times during the night. So should I tuck the duvet in or leave it loose?