Baby cribs are designed to provide a safe and comfortable sleeping environment for newborns and young children. They come with a range of features to ensure the safety and comfort of the baby. The features of a baby crib include adjustable mattress heights, removable side rails, breathable mesh sides, and locking wheels. The adjustable mattress heights allow the crib to fit the baby's growth, while the removable side rails provide easy access for parents. 

The breathable mesh sides ensure good air circulation and the locking wheels ensure the crib stays in place. Additionally, some baby cribs come with additional features such as a rocking feature, a changing table, and a storage drawer. All of these features help to provide a comfortable and secure sleeping environment for the baby.