I've noticed lately that many of the progeny that I see of about the same age group as my three children are overwhelmingly female in numbers. I've noticed this most strongly at the swim lessons my children are signed up in. Looking at all of the other swim classes that are going on at the same time as the lessons of my children, I'd say about half of the classes are all girls while the other half are on average 3 to 1 girls to boys.
We had a birthday party for V-8 this weekend (she is now 3 years old), Saturday night, and there were mostly our friends who also happen to have kids over. The girls (M, a, c, v, m, h, g) 7, out numbered the boys (b, j, c, g) 4.
I don't know if this is a real trend, or just a coincidence in that these particular circles are skewed one way, but other circles are equally skewed in the opposite direction.