The premature infant's body is unable to maintain body heat. To
prevent hypothermia, a potentially dangerous loss of body heat, the infant is
kept warm on a heated bed, either inside a draft-free enclosure (isolette or
incubator) or under a radiant heater.
As the infant's neurological system, skin, and metabolism mature, the
infant becomes less vulnerable to hypothermia. At about 34 weeks'
gestation or
2000 g (4.4 lb), a premature
infant usually can be moved into an open crib.