If you have any concerns that your baby’s crib may be too high, there are a few ways to help determine its safety. Additionally, the size of a standard crib needs to be larger than the minimum standards of 27¼ inches x 51⅜ inches to ensure proper safety for your baby. The overall height of the crib is roughly 30 to 35 inches, depending on the type of mattress and frame. How many inches is a standard crib?Ī standard crib is approximately 28 inches x 52 inches, including the frame and mattress. The CPSC requires that the top of the mattress should be at least 28-inches and no more than 25-inches from the top of the side rail. Consumer Product Safety Commission (CPSC) safety standards or the safety standards of your country. It is important to measure the height of the crib mattress to ensure that it is in compliance with the U. Standard cribs typically range from 28- to 34-inches in height in the United States however, this can vary by region and country. The height of a crib can vary greatly depending on the size, design, and model of crib.