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Early Hum Dev. 2019 Sep 4:104859. doi: 10.1016/j.earlhumdev.2019.104859. [Epub ahead of print]

Effects of earthquakes and other natural catastrophic events on the sex ratio of newborn infants.

Author information

1
M&K Health Institute, 30-9 Kariya, Ako, Hyogo 678-0239, Japan. Electronic address: web@fukuda8767.com.
2
M&K Health Institute, 30-9 Kariya, Ako, Hyogo 678-0239, Japan.
3
Shimizu Women's Clinic, 2-2-4 Minamiguchi, Takarazuka, Hyogo 665-0011, Japan.
4
Laboratory of Reproductive Biology Juliane Marie Center for Children, Women and Reproduction, Rigshospitalet, Section 5712, University Hospital of Copenhagen, Blegdamsvej 9, DK-2100 Copenhagen, Denmark.

Abstract

Stress due to earthquakes and other natural catastrophic events may result in a decline in the male to female ratio of newborn infants. One reason may be an increased death of male fetuses 3-5 months earlier. Another reason may relate to reduced conception of males and/or early male embryo demise 8-10 months earlier. Almost all of the earthquakes and natural catastrophic events have caused declines in sex ratios at birth except the Hurricane Katrina which showed a rise in the birth sex ratio. We describe hypothetical immunological cause for the decline in the sex ratio at birth following periods of augmented stress levels.

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