Researchers say that low blood pressure probably indicates that a woman will give birth to a baby girl.

A study found out that blood pressure during the 26th week before conception can help to predict a baby's gender. Women who have higher systolic blood pressure may probably get a boy. On the other hand, those who have low blood pressure will give birth to a girl.

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To elaborate more, women with 106 mm Hg mean systolic blood pressure will probably give birth to a boy while mothers of girls had 103 mm Hg.

"When a woman becomes pregnant, the sex of a foetus is determined by whether the father's sperm provides an X or Y chromosome, and there is no evidence that this probability varies in humans. What is believed to vary is the proportion of male or female foetuses that is lost during pregnancy," endocrinologist Ravi Retnakaran said.

He noted that blood pressure before pregnancy and its relation to a child's gender had not been studied before.

His study "suggests that either lower blood pressure is indicative of a mother's physiology that is less conducive to survival of a male foetus or that higher blood pressure before pregnancy is less conducive to survival of a female foetus."

Related studies mentioning stressful events like natural disasters, wars, and financial crisis have also revealed that gender proportions can be affected by the said factors. One explanation is that stressful times make survivability of one gender. 

Professor Charles Kingsland said that "there is also some evidence that you are more likely to miscarry a boy when you are compromised either by health or environmental issues. So I suppose, blood pressure changes in these circumstances might affect conception of different sexes."

The study was published in the American Journal of Hypertension.