Exposure to traffic pollution could affect the development of babies in the womb, US researchers have warned. What this in effect means is that from the minute a woman finds out she is pregnant she needs to be whisked away to the countryside for 9 months in order to avoid traffic polution. There's not many dads that I know who would argue against this.
If you add to this the huge list of other things that are apparently bad for pregnant women: smoking, alcohol, hot tea, chocolate, certain fruit and vegetables, loud noises, altitude, confined spaces, etc etc etc, its not much fun being a pregnant woman is it? There again, they can look forward to 12 months off work after birth courtesy of my taxes so its not all a bad thing.