Background: Sex ratio is important for human life since its creation, some families prefer male than females, also its related to some medical problems that affect certain sex than another. Studies showed that males are more fragile, and might die earlier than females. Climate has a certain effect on male to female ratio of the pregnancy outcome and certain seasons are in favor of male than female reproduction.
Objectives: To evaluate the effect of climate and seasonal variation on the sex of live births in a sample of pregnant Iraqi women.
Subjects and Methods: This study was carried out on 2424 live babies (apart from 225 miscarriages) of women attending Al–Numan teaching hospital and Al-Husaynia health care center, from January 2017 till January 2019.The time of last menstrual period recall was taken from each mother of this study. an early ultrasound test was done to confirm the accuracy of pregnancy duration. The gender of live babies, maternal age and parity were recorded.
Results: The highest birth rate were in Autumn (721) then Winter (662), Spring (577) and the least in summer (521).
The male to female ratio increased with maternal age. Mothers of 30 years and over have 1.09male female ratio as compared with those under the age of 30 years (0.929).