Going with black and white is a chic way of dealing with design choices when finding out the sex at birth. The black and white also becomes a clean backdrop to toys and things that start to accumulate, making the space feel less cluttered. Plus, it's a good neutral combo for adding color accents later (and a good excuse to use chalkboard paint).
Here are a few adorable B&W rooms. What do you think? Minimalism gone too far or just the right amount of cute?
Images: As linked above.