BBC News - Why are more boys than girls born every single year? http://www.bbc.co.uk/news/health-46597323

Check out this quote "The first theory is an evolutionary one which says that in order to have an equal number of males and female in adulthood, there have to be slightly more males born.

That is because being a male is a dangerous thing. Males are more likely than females to die in childhood and at all stages of life - from accidents, taking risks, suicide and from health problems.

At every age, in almost every time and place, a man is more likely to die than a woman," says Prof David Steinsaltz, associate professor of statistics at the University of Oxford"

If it were the other way around the title of the article would be "more girls and women die at all stages of life!!!"