I used cellular blankets until around 4 weeks when ds moved to a sleeping bag.
He was in sleeping bags until just over a year old, when I switched to a toddler duvet.
Don't be sucked in by the pretty bedding sets in the shops like I was. The bumpers aren't safe to use at all really due to risk of suffocating (the labels on mine said don't use once baby will roll). The duvets can't be used until after a year old.
For this baby I'll stick with blankets and sleeping bags again.
We used pillow cases for the pram mattress. DS was 10pounds so we used a gro bag from birth. We picked up a couple at a charity shop and then got the next size up at NCT sales. We also had quite a few cotton blankets for day time in the cot or wrapped in arms ect. Again charity shops are good for this sort of thing because you can wash cotton hot.
Any old fleece blankets, folded appropriately. Honestly.
I know we all trug off to Mothercare etc, but my oldest is 10 this year, & you could drop a newborn on me out out of the sky tomorrow - I have blankets, it'd be fine!
Avoid cot bumpers & duvets.
Moses baskets are fine with a pillow case in lieu of a sheet. Once you move to a cot you can buy fitted cot sheets, or just use an old single sheet - pull it taut & tuck all the excess under the mattress.
Basically, have fun buying cute stuff if you'll enjoy doing so, but your baby will be fine with whatever you have.
Thank you everyone! I feel a bit more confident now. If read that bumpers and duvets weren't appropriate for little ones but was starting to wonder why all the shops sell them? Ill stick to my gut and use a couple of blankets