THE infant mortality rate in 1947 was the lowest on record, according to figures released by the National Office of Vital Statistics of the Public Health Service, Federal Security Agency. The number of deaths under one year recorded in the United States during 1947 was 119,173, or 8,110 more than the number (111,063) reported in 1946. However, this increase reflects the tremendous increase in the number of births during 1947 and not a rise in infant mortality. The relative frequency of infant deaths as [SEE TABLE 1,2 and 3 IN SOURCE PDF] measured by the infant mortality rate decreased from 33.8 per 1,000 live births in 1946 to 32.2 in 1947. Provisional figures indicate a further decline in 1948 to an estimated rate of 31.8.
The five leading causes of infant deaths in 1947 and the infant mortality rates for each are: premature birth, 11.1 ; congenital malformations, 4.6; pneumonia and influenza, 3.6; injury at birth, 3,5; and asphyxia and atelectasis, 1.6. These leading causes accounted for 75.7% of all the infant deaths in 1947. This was the first year that asphyxia and atelectasis ranked among the five leading causes of infant deaths and that diarrhea, enteritis and ulceration of the intestines has not been in this group. The number of deaths [See Table 4 in source pdf] under one you and infant mortality rates for selected causes in the United States during 1946 and 1947 are presented in Table 2.
The relative frequency of deaths under one year is greatest for the under one day age group and decreases steadily with age. Mortality is higher among nonwhite than white infants deaths and among male than female infants. The number of infants deaths and infant mortality rates in the United States for 1947 by subdivisions of the first year of life, race, and sex, are shown in Table 1.