There is a vintage baby store in my city. They only sell vintage baby clothes. Frankly, I think it sounds like the stupidest idea in the whole world. Why would you pay top dollar for second hand clothes for a little baby who has no way to appreciate them?
I have had three children and for me baby clothes are a completely utilitarian proposition. Keep them covered and keep them warm. Nothing else much matters beyond that.
It drives me crazy when I see parents dress there kids up like little adults. Look, it's baby rap star or baby hipster or baby biker. Why would you want a child that young to already be obsessed with style?