Size: The first thing to consider when shopping for a mini crib is if the crib will fit your space. Check the measurements of the crib and see how it'll fit in the place that you want it today and in the future. This is important if you plan to use it in place of a bassinet and in the future when you'll place it in a nursery. Safety: Make sure the crib is certified by CPSC and ASTM. There's all sort of metrics they must pass, but don't worry about it, if they have these certifications, feel confident the crib is safe. If they also have JPMA certification, that's a bonus. Wheels: If you want to have it mobile, make sure it has wheels. Also measure the width of your door frames to make sure the crib you choose will fit.