An neonatal incubator is a medial device used to maintain an optimal environment for the care of a new-born. Generally it is used for premature babies, meaning those born pre-term, or before 37 weeks of amenorrhea (a measure of time used in pregnancy), but also those with certain congenital diseases. Sterile and warmed to an ideal temperature, the incubators let the infants continue their normal development. The incubators are equipped with small openings, allowing the caretaker and parents to touch the baby. Strict rules of hygiene must be respected before contact is made.