Yup I agree, the short sleeve stuff is a goer because you'll likely be wrapping for the first little while. DD was a summer baby which was a pain because the only wraps we could use were muslin and even then it seemed too hot to wrap her. Better for bubby to be slightly cooler than warmer, and you can adjust with an extra layer (like a cardigan) or a warm wrap.
My bubs is due end of May, so it'll be close enough to winter, but I still have some lighter cotton/cooler stuff because I'll use wraps.