If you plan to co-sleep, not really useful, otherwise has to have one. My
boy sleep in crib from day one even though we planed to co-sleep and bought
a king size bed for this. However, we didn't find a safe and comfort way to
co-sleep with a baby. Now look back, I think it is a good decision to let
him sleep by himself in crib, good for him and us. Now he sleeps in a crib
in his own room (11 months ).