I have a 2yo boy whose just moved into a big bed. He's currently using the blankets from his cot, is it safe to transition to a duvet? Thankyou

Red Nose recommends withholding any soft/loose bedding, like a duvet, until a child is in a bed.
https://rednose.org.au/article/at-what-age-can-i-introduce-cot-bumpers-and-pillows

Red Nose does not recommend placing a pillow where baby sleeps unobserved. It is safer to wait until the child starts to sleep in a bed before introducing a pillow. The Australian government states it is safer not to use a pillow at all for children under two.
https://rednose.org.au/article/pillow-use

When moving a child from a cot to a bed, have a look at the Red Nose resources.
https://rednose.org.au/article/search/eyJyZXN1bHRfcGFnZSI6ImFydGljbGVcL3NlYXJjaCIsImtleXdvcmRzIjoiY290IHRvIGJlZCJ9