[mrweasel]

Just a thought, based on my own experience. If you have children, or is about to have a baby, you start being around more parents or "parents to be". Either as part of parenting groups, in conjunction with daycare, schools or parents of your children's friends. Because this centers around your child, the children around you tends to be roughly the same age, plus or minus a few months.

[homeonthemtn]

I agree with you, but this is not the case. It is very much a trend with people in their mid 30s right now. The overlap is there yes, we have friends who have children, but for instance my wife announced her pregnancy and had 4 friends announce shortly there after. We certainly did not conspire with them on conception :)

It is an odd time for everyone to be really into kids but perhaps that is a species trigger for all we know