Thank you for the links, very interesting. There is also this: http://genderdreaming.com/family-balancing/natural-gender-swaying/science-behind-gender-swaying/

Thank you for the links, very interesting. There is also this: http://genderdreaming.com/family-balancing/natural-gender-swaying/science-behind-gender-swaying/ph-balance/ http://genderdreaming.com/family-balancing/natural-gender-sw... I have noticed that in some small immigrant population pockets in the US the majority of offspring is boys, and I've been wondering about the biological causes for this phenomenon. The explanation I heard is that the acidity can be regulated by stress levels of the female, causing more boys to be born in a more stressful environment. At the time I thought it's pure pseudoscience.