Two bottles and a pack of diapers was my first buy before knowing the sex.
Right after knowing I got a crib.

I started shopping around 20 weeks with my other 2 pregnancies. With this one I have everything still from my daughter so I don’t need much. I’ll prob shop for her in about a month or so. I don’t think there’s any right or wrong time to buy. I generally buy the bigger things first because I know a lot of people like to gift things like clothes and diapers, wipes etc.