Rubber Wood, Metal Grow with Your Baby: This crib features 3 adjustable mattress heights to keep up with your baby's growth. The high position is suitable for newborns, the middle position is ideal for infants who learn to sit up, and the low position is ideal for infants who learn to stand. Selected & Durable Material: Crafted from solid rubber wood frame, the baby crib ensures excellent stability and long-lasting use. Besides, the natural & safe wood material won't do harm to your baby. Sturdy Frame & Thoughtful Design: Stable slanted supporting legs and sturdy metal mattress base not only offer strong support, but also increase overall stability. Plus, the smooth & burr-free surface is safe for the baby to touch. Designed for Your Baby: Made of non-toxic material and featuring ASTM certification, this wooden infant crib creates a safe environment for the baby to sleep. It is an ideal gift for parents who have newborns. Hassle-free Assembly: Equipped with detailed instructions and complete accessories, this toddler fence bed is easy to put together. Please note: the mattress is not included. And the recommended mattress size is 131 cm x 69 cm x 15 cm/ 51.5" x 27" x 6" (L x W x T).