Useful
Muslins - sick, dribble, stuffing down bra for inevitable leakage from the other boob if you are breastfeeding, light blanket if it's too warm for a proper blanket etc
Cheap big blankets e.g. From primark to put on the floor to put baby down on, we have all manner of bouncers etc but they apparently shouldn't spend too long in those even if it says from newborn
Clothes - dd was born 7lb6 and was in newborn/up to 1 month for 6 weeks then has nearly grown out of 0-3 months by 9 weeks! I would buy barely anything clothes wise, just bare essentials then wait to see how many thousands of presents you get and what size baby is and take it from there. Also don't bother with the plain packs of vests etc as you will want to put them in cute little clothes not boring old white vests
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baby nail cutting set - scratch mitts are crap and our dd likes to have her hands out anyway so much better to cut the nails tbh. Also get a soft baby hairbrush for brushing out inevitable cradle cap!
Bath stuff - we got a cheap washing up bowl for the bath and use a sponge/cotton wool to clean her and baby Castile soap (no nasties) then after bath massage with almond oil. Johnsons stuff is full of crap
Aldi nappies!
Cheap portable changing mats from bm bargains (2.49) so we have one downstairs, one upstairs, one in change bag and one in the nursery
Microwave steriliser, any brand. We have an avent one but use it to sterilise everything and have no avent anything.
If you are breastfeeding - breast shells (can create a store of excess breastmilk for the freezer etc without having to pump), breast pads!!!, a Netflix subscription!
pointless
Scratch mitts
Bibs (unless bottle feeding)
Loads of clothes - they don't get dirty unless they're sick really so if you don't have a sickly baby then you won't get through too much washing
Baby t-shirts! Why?! They spend most of the time ridden up by their armpits!! Grrrrr such a con
Baby dresses - see above