Hi, hope your pregnancy is going well and you're enjoying your bump! - Stocking up in advance is a good idea, but you might find your baby doesn't suit a certain brand and you're left with stuff you can't use. And a lot depends on your personal preferences - e.g. how eco friendly you want to be etc. My earth mother tendencies went into overdrive when pg with DS, I bought reusable nappies, wanted to save the planet etc. Then discovered said reusable would be too big for newborn, so got pampers newborn nappies, used them for a couple of months, then alternated with nature nappies in the day, pampers at night, as found pampers more absorbent. Sold the resuables on ebay! When DD came along, it was pampers all the way, as the lure of asda's special offers on them was too much with 2 DCs in nappies for a while, and the cost of nature nappies was too much. When pg with DD, I knew I'd use pampers, so was able to stock up over the months on the first few sizes whenever they had offers on. (I love pampers nappies, but other mums will say they prefer huggies, boots own, supermarket own etc.)
Both DCs ended up with baby excema, so despite generous SIL buying lots of burt's bees baby products, we couldn't use these at all on them. We now use a combination of oilatum off prescription, and when their skin is calmer, boots baby botanics suits them. - Again, though it's really down to what suits your baby. We also used another organic range for a while, it's on sale in boots, but I can't remember the name. - At the beginning, you don't really need to use toiletries on them, a really mild baby or vegetable soap should do the trick. Check out the ranges in boots, see what you like the smell of, if less chemicals is important to you see which ones have less ingredients etc. We did use the burt's bees diaper cream, as found this worked like magic. It's expensive (from memory around £8 a small tube I think), but we only ever used it if they had sore bottom, so it lasted ages as it cleared any rash up straight away. - I never used any nappy barrier cream and neither DC ever really got true nappy rash, when they started nursery the girls there thought me a bit odd for not smearing the DC's bottoms with barrier cream after every nappy change, but I never saw the point, they didn't need it. Just personal preference though.
With DS nappy changes, we used the top and tail bowl and water with cotton wool pads, religiously following recommendations, but by the time DD came along, she went straight to baby wipes for nappy time. - We use Simple baby wipes, I've tried a couple of the other brands sensitive ranges, but they don't suit their skin at all, and TBH, I don't think they feel as nice either. Supermarkets tend to have offers on wipes on a cyclical basis, so you can generally stock up in bulk when you know which you prefer. Our local tesco and asda don't do simple wipes , but they're in home bargains, cheaper than most of the other brands.
sorry, no definitive answer, which is possibly why people haven't replied, as so much comes down to what's available where you live, what's your budget, whether you want to go chemical free, and what suits your baby etc. (and you might find it handy to get into online supermarket shopping for the first couple of months to give yourself a break, so it's handy to get stuff your supermarket stocks, or do orders from boots online!)