More Boys Born After Wars

Apparently due to a "mystery" gene.

See: Boy Or Girl? It's In The Father's Genes

As the odds were in favour of men with more sons seeing a son return from the war, those sons were more likely to father boys themselves because they inherited that tendency from their fathers. In contrast, men with more daughters may have lost their only sons in the war and those sons would have been more likely to father girls. This would explain why the men that survived the war were more likely to have male children, which resulted in the boy-baby boom.

Another Risk To Caesarean Births

See MSNBC: C-sections tied to higher asthma risk for babies: Natural birth helps prime infant’s immune system, researchers explain

Babies born by Caesarean section are more likely to develop asthma than children delivered naturally, Swiss researchers said on Tuesday.

There has been conflicting evidence on the link between asthma and C-sections but the researchers said the number of children involved in their study and a long monitoring period strengthened their results.