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Dr. Behrman inquired whether there was an increase in mortality of infants who weigh more than 4,400 gm (10 lb) at birth, commenting that in an earlier study in the higher socioeconomic classes, heavy infants had lower intelligence quotients when tested at school age. He also wanted to know whether one could distinguish in the upper socioeconomic classes infants who weigh more than 4,400 gm at birth. Dr. Rush responded that there was indeed some increased risk at the higher birth weight. He pointed out that in infants with weights up to 3,500 gm (8 lb), there was better survival with the higher weight, followed by a plateau for about 500 gm (1 lb) and then a rise in mortality. He pointed out further than mean birth weight for Western population varied between 3,200 and 3,500 gm (7 and 8 lb), and that 4,400 gm was more than 2 standard
Summarized Discussion of Session I. Am J Dis Child. 1975;129(4):437. doi:10.1001/archpedi.1975.02120410025010