A heated mattress is a water mattress that maintains a certain preset temperature. Adjustment is made on the basis that the baby should be able to maintain a body temperature of 36.5–37.5ºC without using additional energy.
The baby wears a diaper and a small jumper. To ensure that the baby has sufficient support, it can lie in a baby nest on top of the water mattress. The baby will also be covered with a blanket so that the heat from the water mattress stays around the baby. If the baby has difficulty keeping warm, a special blanket can be used – a Flectalon blanket, which reflects the heat back to the baby.