A Study of the Sex Ratio of First-born According to the Mother's Month of Birth

Overview

Journal Arch Gynecol

Publisher Springer

Specialty Gynecology & Obstetrics

Date 1983 Jan 1

PMID 6660920

Citations 4

Authors

T Miura

K Nonaka

M Shimura

I Nakamura

Affiliations

Soon will be listed here.

Abstract

The male-to-female sex ratio at birth of the first-born babies delivered in Japan to mothers aged 25 years or less was investigated in two groups: a hospital group and a questionnaire group. The sex ratio fluctuated according to their mother's month of birth. Between 1924 and 1928, the sex ratio of the offspring of the mothers born in March-May in both groups was significantly higher than that of the other mothers. We speculate about the relationship between the sex ratio at birth and the mother's month of birth.

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Season of birth and dopamine receptor gene associations with impulsivity, sensation seeking and reproductive behaviors.

Eisenberg D, Campbell B, MacKillop J, Lum J, Wilson D PLoS One. 2007; 2(11):e1216.

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