A Boy or a Girl? Science Facts

Feb 10, 2009
What are your chances of having a boy or a girl? Many parents-to-be are trying to conceive a baby of particular gender. Aside from old wives tales, several scientific studies suggested that odds of having a boy or a girl depend on certain factors, such as:


According to the internet survey women have more chances of having a boy if they are craving spicy food, while women pregnant with girls prefer chocolate.
The study conducted at University of Exeter and University of Oxford found that women are more likely to have boys if they preferred high-energy food with the increased intake of protein, fat, folic acid, vitamin C and cereals.

Weight gain

Scientists revealed that women gaining extra weight between pregnancies have more chances of having a boy during their second pregnancy. According to the study conducted at Harvard School of Public Health and Karolinska Institutet that included more than 220,000 women, increase in weight between the first and the second pregnancies seems to favor the birth of boys. However, scientists warn that women should not try to gain more weight at conception or during pregnancy to have a baby boy because excessive weight can become an obstacle to successful conception and puts certain health risks to the mother and developing baby.

Personality traits

Interesting enough, scientists discovered the link between woman's outlook and chances of having a boy or a girl. Dr. Johns at Kent University revealed that optimistic women have better chances of producing boys. She asked moms-to-be how long they expected to live and found that women, having optimistic frame of mind were more likely to have boys. It was explained by the fact that psychological outlook may somehow influence the level of sex hormones at conception.

Another study revealed that energetic and dominant women have better chances of having a boy than a girl. It seems that women with higher levels of testosterone have more favorable environment for the sperm that produces boys. It was also noted that stressed women also have higher levels of testosterone that may increase their chances of having a baby boy.


If takes you longer to conceive, you are more likely to have a baby boy when you succeed. According to Dutch study, for women who took more than a year to get pregnant, chances of having a boy are higher (58 percent). It is known that it may take longer for women having more viscous mucus to get pregnant because it is more difficult for sperm to swim. But if a woman succeeds in getting pregnant it is more likely that sperm producing boys got through as they are faster than X (female) bearing sperm.