Having a Boy?


"the October 2000 issue of the Disease in Childhood medical journal. In that article, German researchers found that the scrotal skin temperatures of baby boys were significantly higher when they wore disposable diapers than when they wore cloth. While the scientists called for more research, their article suggested that prolonged use of disposable diapers as infants was an "important factor" contributing to the decline of sperm production among adult males." 

Sources: 

http://adc.bmj.com/content/83/4/364.full

wired.com