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Published 09:43 13 Feb 2017 GMT
Updated 09:47 13 Feb 2017 GMT
Add us as a preferred source on Google »Researchers still really can't explain why weight gain could predict gender, but they discovered that mums-to-be who only gained low amounts of weight and miscarried were more likely to lose a male fetus.
It's believed that before birth, boys have a higher metabolic rate than girls which mean they need more nutrients for growth and development.
But do remember the results don't prove causation so nothing you do during your pregnancy can change the sex of your baby.
It is recommended that a healthy pregnancy weight gain for mums is between 25 to 35 pounds.
What do you think ladies - did the size of your bump reflect the study or not?