Light bulbs heat air in the bottom part of the incubator. The air passes over a container with evaporating water, so that its humidity increases. The warm, humid air then flows upwards (chimney effect) into the baby compartment. A thermostat in an exit hole compares the air temperature with the desired temperature. If it is too high, the light bulbs will be switched off; if it is too low, the bulbs will be switched on. The baby can be viewed through Perspex and it can be handled via two armholes with sleeves. The Perspex front and top can be hinged back for full access.