The size and type of bed will determine the size of the bed rail you will need. The length of a toddler bed is usually between 4-5 feet long. Meaning you’ll be able to use a bed rail of that size or smaller. You will also have the option of choosing a design that is placed at the height of the child's headrest.
When considering the height of the bed guard, it is recommended that it be between 15 and 20 inches tall. The choice you make regarding this particular detail will depend on the child’s sleep habits and the desired level of safety. In any event, make sure the model you rises at least 13 inches above the mattress.