Fit Standard Crib Size Mattress: It's a Standard Crib Size Toddler Bed. You will need a standard crib size mattress to fit it. It just big enough for the kids who are 2-7 years old. Foam Filled Inside: There is foam filled between the wood and velvet outside. And every single corner is polished. So the kids won't get hurt even if they bite the bed. Additional Safty Board: There are 2 Safty board come with this bed. It's to ensure child won't fall off from the bed as a mistake. But they can still turn it over if they want. So please spread a soft cushion near the bed to ensure your baby won't get hurt 10 Mins Assemble: This toddler bed have only 4 Main parts and 16 screws. It won't takes more than 10 mins if you have a electric screw driver. And if you got any question, please use the contact seller button or contact the email address on the instruction. I will try my best to help you.