I know from experience that raising a son is no walk in the park. Am not saying that a daughter would have been easier, but it seems that more and more data are being unearthed that indicates just how much of a toll it takes to have a son. Take for example an article from BBC which discusses data indicating that having an older brother may reduce one's fertility.

They found that both men and women, whose mother had previously produced a son, produced and raised fewer children than those born to mothers who had previously produced a daughter. Children with an older sister had 12% more children.

Another study says even showed that having a twin brother can reduce his female twin's chances of having children.

Women were 25% less likely to have children if their twin was male, the study found.

Wow, who would have thought that having a older brother can have such an impact. I wonder how much of the "trauma" is really physiological, or is it perhaps psychological?