Stress during pregnancy may affect baby’s sex

Pregnant women experiencing physical and psychological stress are less likely to have a boy, says a new study.

“Stress can also affect the mother’s immune system, leading to changes that affect neurological and behavioural development in the foetus,” said the study leader.

“What’s clear from our study is that maternal mental health matters, not only for the mother but also for her future child,” the researcher said.

For the findings,  the research team examined 27 indicators of psychosocial, physical and lifestyle stress collected from questionnaires, diaries, and daily physical assessments of 187 otherwise healthy pregnant women, aged between 18 to 45.

About 17 per cent of the women were psychologically stressed, with clinically meaningful high levels of depression, anxiety, and perceived stress. 

Another 16 per cent were physically stressed, with relatively higher daily blood pressure and greater caloric intake compared with other healthy pregnant women.
The majority (nearly 125) were healthy.

The study suggested that pregnant women experiencing physical and psychological stress are less likely to have a boy. 

The sex ratio in the physically and psychologically stressed groups favoured girls, with male-to-female ratios of 4:9 and 2:3, respectively.

According to the researchers, physically stressed mothers, with higher blood pressure and caloric intake, were more likely to give birth prematurely than unstressed mothers.

Psychologically stressed mothers had more birth complications than physically stressed mothers, the study said.

An estimated 30 per cent of pregnant women report psychosocial stress from job strain or related to depression and anxiety. 

Such stress has been associated with increased risk of premature birth, which is linked to higher rates of infant mortality and of physical and mental disorders, such as attention-deficit hyperactivity disorder and anxiety, among offspring.

When social support was statistically equalised across the groups, the stress effects on pre-term birth disappeared, the study added. 

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