Hi bellini, first time mum here too, 7 weeks in, here's my thoughts:
- Perfect prep will only be useful if you end up giving formula. You have no way of knowing this now! Be prepared to stay in hospital for an extra couple of nights for midwife support with breastfeeding, they're angels! And, if for any reason it doesn't work for you, order one from your hospital bed.
- Sterililising: I'm bfing with 1-2bts if expressed per day, because that works for me. It's not for everyone and if you exclusively bf, you won't be sterilising anything. Save yourself the money and if/when you need to, get a big Tupperware box and some Milton tablets, the two will cost under a tenner.
On the bottle subject, again IF you end up needing them, it's worth getting them at the same time as perfect prep/breast pump as not all are compatible. If you buy now, you could end up with a ton of useless kit. Again, my experience, but Medela pump and Calma teat have been brilliant, we used from 4 days old. Only good for breastmilk though, so no point buying until you know.
Cot - cotbed as are big, so if you won't be in the flat at the point of changeover from cot to bed, save the space and buy a small crib/cot.
Baby bath - again for space reasons, the Stokke folding one is great. Expensive new, but can be found on eBay/gumtree if willing to go secondhand. Newborn insert only necessary if not confident bathing without - DH has done every bath and he doesn't bother with it. Bear in mind that minimal baths necessary at the beginning, we're still only on 2/3 a week.
Bouncer - think space again and find one that folds up. Go simple, my DS literally sits in it and stares around the room, not all babies like the vibrating/rocking etc.
Car seat - Maxi cosi Familyfix Isofix base does first and second seats, plus their adapters for prams are easiest to find. You can save s shed load of money buying the adapters secondhand and these only come into contact with the seat/chassis.
Hospital bag-wise, pack toiletries and clothes as if you were going away for a lazy weekend. Take plenty of basic big black pants, maternity pads and nipple cream! And snacks, hospital food is awful.
Buy a few basic baby grows, short sleeved and sleeveless vests. You do not need very many Buy white for ease of washing. Most companies seem to think that babies come out massive btw, at 6lb 12 they were all falling off DS, so maybe buy some tiny baby size just in case, but leave them in the packaging so you can wash or exchange when you know whether you need them or not.
Hope that helps, you've got plenty of time and click & collect is a godsend in those early weeks! Good luck x