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playpen 
Bed that closes up, usually used when traveling.
changing table 
Detachable shelf for tending to the various needs of the baby.
mattress 
Large stuffed cushion upon which the baby sleeps.
top rail 
Elevated part of the sides of the bed protecting the baby from falling.
mesh 
Perforated side that ventilates and protects, but the child can see through it.