We bought the bare minimum as were in a tiny house and have lots of friends who are parents and passed things down, but stuff we got given/bought and really didn’t use...
Baby bath - takes up space. Also it’s fun and lovely bathing with your baby, or you can plop them in the sink for a quick wash if you don’t fancy stripping off yourself.
Washable nappies - I still feel guilty about this. We used disposables in hospital then got addicted to the convenience.
Scented baby bath/baby powder/baby oil: yuk, and gave him eczema.
Medela bottles for breast milk - he refused a bottle for months then choked on these. Tommee Tippee ‘closer to nature’ were better but he still looks disgusted at not-an-actual-boob at 10 months!
Things we found really useful...
Slings - we didn’t get a pushchair til he was 7 months and heavy. Less to store, and you can go anywhere including muddy footpaths/sandy beaches/through narrow gates/over styles. Plus AMAZING for getting stuff done in the house and getting fretful baby to sleep. Stretchy cloth at first then a connecta when he was a bit bigger (still use this sometimes).
Hand pump for engorged boobs/milk when you’re out. Also lansinoh nipple cream.
Billions of maternity pads.
Puppy mats for leaky boobs/lochia/sicky baby in your bed in the early days.
Bouncy chair so you can wash your hair!
Frozen meals in the freezer.