THE BABY'S SEX EFFECT WITH PREGNANCY TIME
According to the new study and research, if woman take longer to get pregnant,
the baby gender more likely birth to a boy. Researchers say the findings may
help explain why more boys than girls are born worldwide, despite the fact that
human semen contains equal amounts of X (female) and Y (male) chromosome-bearing
In the study, published in the BMJ, researchers compared information on more
than 5,000 Dutch women who gave birth between July 2001 and July 2003.
Boys More Likely When Pregnancy Takes Longer
The results showed that among the 498 women who took longer than one year to
get pregnant, the percentage of male babies was nearly 58%, compared with 51%
among the women who took less time to get pregnant.
Researchers estimate that for couples conceiving naturally, each additional
year of trying to get pregnant is associated with a 4% increase in the likelihood
of having a boy, even after adjusting for other factors, such as age, smoking
status, alcohol use, and menstrual cycle variations.
But for couples using fertility treatments to help become pregnant, the study
showed there was no link between time to pregnancy and the baby's sex.
Researchers say the results support the idea that sperms bearing the Y (male)
chromosome swim faster than those bearing the X (female) chromosome in thick
and sticky fluids and are more likely to fertilize an egg when the women's cervical
mucus is difficult to penetrate.
Previous studies have shown that women with thick and sticky cervical mucus
take longer to become pregnant and are more likely to give birth to boys. (By
Jennifer Warner - Baby.TopResource.NET Reference)
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GENDER OF BABY (BOY OR GIRL)