Agree not to buy too much in advance. In your case, I'd focus on the 3-6 mo size. Many kids never wear newborn sizes at all because they are born too big, and even if they do it's for like a minute.
Then you'll need some 0-3 month stuff but I'd just do the bare minimum for two reasons. The first is that they will likely outgrow it before they hit 3 months (I had a 50th percentile baby and she did). The other is that if you have a child under 3 months in the summer in DC, they will wind up being mostly naked a lot of the time. Mine slept in nothing but a diaper and a swaddle for the first two months of life (July baby) because anything else left her sweating. When we went out, she generally wore a short sleeve onesie and some socks (which she instantly took off). I'd bring a pair of loose cotton pants (in a 3-6 month size, I don't think I even had pants smaller than that because newborns don't need fitted pants) and a cotton cardigan in case we went inside somewhere with air conditioning. And that's it. Even outside the house, she spent probably 70% of her time at that age in a carrier, and I dressed us both lightly so that wouldn't be too uncomfortable.
For brands, Carters is great for onesies. I also relied on Target a lot at that age. Their Cat & Jack line is great for babies and toddlers -- very soft and stretchy and come in cute prints. Also really affordably priced. I also always kept my eyes peeled on my neighborhood list serve for people getting rid of baby clothes -- you can get a whole bag of hand me downs that way and it's like a little ready made wardrobe for the next couple months before your kid grows and needs more.
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