Introduced the pilow about month ago. I have belly sleeper so pillow seems to help even more. Not duvet yet as it's too big and she's moving a lot, so we are still using sleeping bag.
I don’t use a pillow yet but I’ve been using a thin duvet for months. My daughter doesn’t sleep in a sleeping bag anymore as she’s been walking since 10 months and was getting frustrated she couldn’t stand or move properly in the night so we ditched the bag and replaced it with a cover in her cot. 👍
Yep we have a toddler/baby pillow under his cot sheet. He loves it