The Petra toddler bed has a low profile, making it safe and easy for parents and children alike to transition from crib to bed. It can support more than 250 lbs. Parent and child can share a bedtime story just before drifting off. The bed is made of birch ply. Bed measures 60 X 36, headboard is 20H and platform is only 8H for safety and easy. The guard rails are detachable. Bed accepts all standard crib mattresses. Click on image for greater detail. The Petra Toddler Bed is part of the Wonders Collection. Each piece of furniture is named from one of the listed wonders of the world. There is a hang-tag on each piece of furniture featuring information and imagery of the namesake. Each hang-tag teaches the reader and the listener about the most fascinating and bewildering architecture and scientific phenomenon ever recorded. This toddler bed is named after the City of Petra. Over two thousand years ago, a tribe of people called the Nabataens carved a city directly out of large rocks sticking out of the ground The city, named Petra, was fortified by the very rocks it was built into. Caravans of people came from far and wide to this center of trade.