Other Crib Mattress Dimensions. Unlike full-size crib mattresses, the dimensions of mini crib, travel crib and bassinet mattresses can vary. On average, mini crib mattresses are 24 by 38 inches.

Crib mattresses typically come in one standard size to ensure a safe and proper fit within the crib. Standard crib mattress size Length: 51 5/8 inches (132.1 centimeters) ...