Columbia subject headings:
Premature infants--Care--History.
Premature infants--Hospital care--History.
Premature infants--Nutrition--History.
Harvard subject headings:
Incubators--History.
Premature infants--Care--History.
Premature infants--History.
Premature infants--Hospital care--History.
Premature infants--Nutrition--History.
Premature infants--Nutrition.
Princeton subject headings: