J.L.
Keep it simple. When they're newborns, you really don't need to buy gender specific stuff if don't want to. There are plenty of adorable neutrals out there.
Just invest in enough sleepers and onesies to get you through the first month and worry about pinks and girly later if that's why you get.
Besides, even though you may not have a second baby shower, people WILL buy you new things anyway. So you can tell them to keep it neutral. Pastels are safe for both boy and girl. Just avoid pink. Everything else will work for either.