Abstract
SINCE statements of neither the day of conception nor the date of the last menstruation are usually reliable, most physicians consider an infant weighing less than 2.5 kg. (5/2 pounds) to be premature. The diagnosis of "prematurity by weight only" is frequently made when information indicates a full-term pregnancy.Some of these infants regarded as premature solely because of their weight can be assumed to be hereditarily small. Others are malnourished.Recently, 3 such undernourished infants, whose poor nutritional status presumably was caused by abnormalities of the placenta, came to my attention. The clinical course was similar in all and . . .

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