i just re-read your post and realised how young your bub is.

so my revised ideas, to make it easier for you (life iwth a nb is hard enough!)

- cute tooshies bamboo delights fitted nappy - sold at bubblebubs now
or a itti bitti boo in small - sold at itti bitti, nurture nappies
- bear bottoms small night cover (nurturenappies website) or nb sized staccinator 300wt cover (booroi website) or the smallest swaddlebees fleece cover (theweewuns)

newborn sized bamboo boosters at sustainable hemp products - brilliant

If you are unable to buy that much new stuff, my other idea, buy Greenkids bamboo boosters to put inside the BG INSTEAD of microfibre insert it comes with.

Some nb's wet more than others, or another thing, you may need to change him more often than at present. Does he have long sleeps - making it hard to change him?

there is a thing called DREAM CHANGES. you change the bub, when they're asleep. some bubs are fine with that, other bubs, it rouses them too much. My bub could cope with it, UNLESS i had a cover with an APLIX, the sound of that woudl wake her up.

my bub pooped and wee-ed SO frequently, we had to change her 20x a day at newborn stage! once BEFORE two hourly feeds, and once AFTER the feeds.

a suggestion for how to dress a nb for bed - not sure of your climate

bunny rug - i would worry if about SIDS with a rug at this age, it could slip over his face and suffocate him. babies move in their sleep.
swaddling would be safer than the rug, at this age
until they can hold up their own neck, i would avoid rugs
if you are not confident/happy with swaddling (fair enough) what about cotton sleeping bags? i see them at bestn less and big w (under $20).

singlet or spencer
nappy and cover
sleeping bag or swaddling
cotton sheet
we put a lambskin UNDER the sheet for even more ventilation

a few ideas for you, sorry to bamboozle you with previousl post, i didn't realise we were talkiing bout a NEWBORN here.
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congrats on your new baby!