Another vote for the Tutti Bambini Cozee. We chose this one over any of the other brands as it folds down flat into its town bag so we could take it away with us for weekends away. At times DS didn’t want to sleep in it, as others have said, but I’d put that down entirely to the fact that sometimes newborns just don’t want to sleep alone, they need the comfort of mum.
We didn’t bother with anything for downstairs as we bought a pushchair with a good size carrycot which he was in till 6 months,
We have a Nuna Leaf, which DS sleeps in now downstairs, but I wouldn’t recommend it from birth as it’s not flat and newborns need to sleep in a flat surface as their backs a so soft and susceptible.
A decent sling is worth the purchase, especially if you end up with a velcro baby. If you do buy one it needs to support baby legs properly so as to not risk damaging their hips. I love my woven and stretch wraps, but they take a bit of practice to learn to use one, their are easier slings to use, but I don’t find them as ‘snuggly’, or attractive.
I’d recommend reusable nappies and wipes, but that in itself is a whole separation conversation.
Bath wise, we never bought anything as I prefer to just get in with him and didn’t start bathing him on his own till he could sit up.
I’d recommend a lay flat car seat, we have the Cybex Cloud Z, which is great, but there are other brands. Whilst a newborn should not be in the car seat for longer than 20-30minutes at a time, having the lay flat function has been great for the odd occasion we nipped out anywhere and left him in the seat because then we were never really coming near the 20-30min mark unnecessarily.
Equally a car seat that has a rotate function is 100% worth the money! It makes it soo much easier to put them in the seat in the car.
Outside of that, we didn’t buy much as for DS as a newborn (other than clothes obviously). Anything else we’ve picked up as he’s got older/become age appropriate