The full crib has three heights:
Highest - 20.8 inches (53 cm) from the floor to the top of the mattress support
Middle - 15.74 inches (40cm) from the floor to the top of the mattress support
Lowest - 8.6 inches (22cm) from the floor to the top of the mattress support
The toddler bed is not adjustable and is about 8.5 inches (21.5 cm) measured from the floor to the top of the mattress support.