Wheels are a very useful feature. Check the casters to make sure they aren't flimsy, because you'll be moving the crib to vacuum under it, change sheets or fetch toys. If you aren't sure if you'll need them, leave them off the crib but keep them nearby. You'll probably want them on the crib by the time the baby is 3 or 4 months old. If you fall in love with a crib that doesn't have wheels already installed, you can buy furniture caster wheels at the hardware store and install them yourself.