0-5 your child will grow very quickly. Luckily we had older cousins who donated many clothes, which in turn might have already been at least second hand, and that we donated on to the next baby.
There are shortcuts. Lean on family and friends to babysit for a morning/afternoon/one say a week. Look out for second hand baby clothes sales, like those run by the NCT. Ask people who are handy with knitting needles to get busy. Set up an Amazon wish list, and tell your friends about it. Second hand furniture is OK, but go and inspect it first. You don't need a top and tail bath.
There are a lot of products out there that claim to a) make your life easier and/or b ) enhance your baby's development in some way. It's usually bollocks. A newborn only needs to be able to hear you. As they get older, rattles, crinkly things are good, then teethers for sore gums. A blankie or a soft toy for comfort. Done.
My baby is now nearly 14 and I shudder at how much crap, literal crap, we bought. Most of which we never used and donated to charity or another family. She's much more expensive now that she needs her phone, her laptop for school, her specialist stuff for art, her Nintendo, her penchant for 50s dresses, hair cuts and colours, make-up, school trips...it goes on.