Thanks everyone that was helpful
I would say wait for the gender. It's s little too early.
Start anytime. It took me FOREVER to add things to the registry. There were so many reviews to read. Plus if you like one item it usually comes in different colors so that really isn't an issue if you don't know the gender yet. Just edit the item later for the correct color. I registered at Amazon and Target.
Don't worry about clothing until you know the gender but even then I added some neutral colors still. I'm having a girl so before I knew that, I knew I wasn't going to have EVERYTHING pink or blue if it was a boy. I personally don't like pink so I had more color options. =)
Definitely don't think it's too early. They have gender nuetral carseats, strollers, blankets, bottles...
you can register for a crib, playpen...
personally it was more fun for me to shop once I knew the gender, but then again, I didn't make a registry. I bought everything myself.
I would wait to know the gender but that's just me .. U can always pick things that would work for both sexes