Hi Jessica, how exciting that your bub is nearly here! It is really cold at night atm so I put my bub in a sleeping bag (with a newborn you would swaddle him) and put a few thick cotton blankets over him. You just short-sheet the blankets so they are tucked right down low and can't cover your bubs face. Yes, you need to be aware that you don't overheat your bub so don't use anything like a doona. Blankets made of natural fibres breathe well so a woollen blanket would also be good.

Best of luck