I agree with the following being a waste of money...
Baby bath, you can get a little seat to put in the big bath to put them in which gives you extra hands to wash with.
Baby carrier, bought one, tried to use it once, never again, will be getting a sling this time round.
Bumbo, luckily never bought one but tried ds in a friends, utterly useless for him.
Cot bumper - didn't fit the cotbed I bought properly, so it just hangs on the wall as decorations as I threw all the packaging away.
A changing bag that had pockets for everything, what a pain to use and not actually that much space to work with, just get a nice big bag to throw everything in.
Bottle warmer - I actually breastfed for the first 5 months but then used the microwave, much quicker and perfectly ok if you shake it well enough.
Ditto about Mothercare bras, ugly and unflattering. I went and bought a couple of really good ones from John Lewis too, and I wore and wore them.
Also talc, far too messy and not needed.
OTOH I have used and used the chair I bought for ds's room to feed him in, depends on your set up though. Also use the travel high seat (that fits on a dining chair) mainly because it has a tray with it and ds gets to feed himself quite happily wherever we are, (can't reach a table when they are under two very easily)