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A study of all infants born in New York State, exclusive of New York City, in 1936 has been made with the intent of investigating the effects of order of birth and age of paretns of neonatal mortality. The study revealed these results. 1) Of the 82,140 infants, 2563 (31.2/1000 livebirths) died before 1 month of age. 2) Firstborn infants, as well as those of higher birth orders, were found to have a considerably higher mortality than the intermediary births. The rate for 1st births was 32.1; for 2nd births it was 26.0. It rose gradually for births of orders 2, 3, and 4, and sharply beginning with 5th births. The rate for infants of order 10 and over was 55.2, more than twice the rate for 2nd births. 3) More than 1/2 of the neonatal deaths (54%) were found to occur among infants born prematurely, while less than 3% of the surviving infants for the 1st month of life were premature. The frequency of prematurity was 42.9/1000 livebirths. 4) The mortality of premature births was extremely high (389.2), and it rose with order of birth. The rate was a minimum for 1st births (329.4) and rose to a

Neonatal mortality by order of birth and age of parents.

Abstract

A study of all infants born in New York State, exclusive of New York City, in 1936 has been made with the intent of investigating the effects of order of birth and age of paretns of neonatal mortality. The study revealed these results. 1) Of the 82,140 infants, 2563 (31.2/1000 livebirths) died before 1 month of age. 2) Firstborn infants, as well as those of higher birth orders, were found to have a considerably higher mortality than the intermediary births. The rate for 1st births was 32.1; for 2nd births it was 26.0. It rose gradually for births of orders 2, 3, and 4, and sharply beginning with 5th births. The rate for infants of order 10 and over was 55.2, more than twice the rate for 2nd births. 3) More than 1/2 of the neonatal deaths (54%) were found to occur among infants born prematurely, while less than 3% of the surviving infants for the 1st month of life were premature. The frequency of prematurity was 42.9/1000 livebirths. 4) The mortality of premature births was extremely high (389.2), and it rose with order of birth. The rate was a minimum for 1st births (329.4) and rose to a
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Neonatal mortality by order of birth and age of parents.

Yerushalmy, J.
American journal of hygiene
MEDLINE Abstracts – Sep 1, 1938

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