Birth of twins does have its own privileges. How very not get direct delivery of two children. But you know, the conditions and the time weight of twins born, was influenced by the sex of the baby.

The experts from the Helen Schneider Hospital for Women and the Sackler School of Medicine at Tel Aviv University, Israel, said that if in the womb was one or two female fetuses pairing of the twins would be great weight. Sharing the womb with a baby girl will give better results in terms of weight or other factors than men, although women also partner or male.

"A baby boy could negatively impact its twin fetuses, this may be due to transport affected by substances such as hormones," said Dr. Marek Glezerman a professor and chairman of the Department of Obstetrics and Gynecology, was quoted as saying by AP.

The researchers examined 2704 double or twin pregnancies by looking at the baby separated by the placenta. Whereas previously it was not too much attention so they can make escape the effects of the baby's gender on the outcome of these pregnancies. Acquired approximately 16 percent result in female twins, twins 70 percent of men and women, and 14 percent of twins boys.

Researchers found that 9.2 percent of twin boys born less than 31 weeks compared with the twin mix of men and women of 7.5 per cent, whereas female twins by 5.5 percent. This shows that the risk of preterm birth occurs at a higher male infants than female infants.

In addition, recent studies also show that weight baby boy bigger than women. However, male infants born from twin fellow men average weight is smaller than the baby boy who was born with twin girls. While babies born to women who have female twin respiratory problems and fewer nerves than the baby girl born from twin boys.

Although the reason for this is unclear, the scientists speculate that one possibility is male fetuses are slightly superior to the competition of nutrients compared to female infants and women also tend to progress more slowly than men. The other thing is, quite affecting hormonal differences between men with women.

The results of this study is not yet provide definitive conclusions. But whatever the sex of the baby she is carrying twins, the most important thing is the second baby was born with the condition of normal or healthy.