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ORDER OF BIRTH PARENT-AGE AND INTELLIGENCE

Am J Dis Child. 1931;42(1):257. doi:10.1001/archpedi.1931.01940130264023.
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ABSTRACT

The authors have reached their conclusions from an analysis of case records from the Institute for Juvenile Research of Chicago and a review of other studies. They conclude from their studies that the first-born and the children of high birth number are definitely handicapped by a higher mortality than the intermediate children. Congenital pyloric stenosis, tuberculosis and criminality are more likely to occur in the first-born child. Neuropathic tendencies are unusually frequent among only children. The percentage of abnormal confinements definitely increases in the group of mothers past the age of 36. Very young and very old mothers have more stillbirths than the intermediate group. The optimum age range is from 20 to 30. There is a higher infant mortality for the children of very old and of very young mothers. The frequency of mongolism increases progressively with the increasing age of the parents. There is no relation, however, between

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