I am researching, making notes, saving things to my Amazon basket for later... but I am keeping the actual purchasing to a minimum, until I know my baby and my postpartum state.
There is a lot of pressure to buy everything now, but most things are available on next day. And you won't be so, so busy that you or your partner can't find 30 seconds to swipe to buy. 😅
I think it's better to research but hold off actual purchase until you know you need them. Otherwise you end up with a "nursery" (storage room!) piled up to the rafters with white plastic tat, that you aren't going to use.
Something to wear, something to sleep in, something to ride around in, something to shit in, a handful of bottles for emergencies. That's my starter for ten.
Something I am stocking up on early are maternity pads. I do not ever want to be without a maternity pad! I have also bought a tube of nipple cream. I will buy 3 more if I breastfeed and I like the stuff. I got the top sellers for both on Amazon. I bought more maternity pads than I think I will need.
FYI, I got my microwave steriliser second hand for £2.