Flu and fevers. Mothers with fevers during pregnancy are more likely to have kids with autism and other effects.
Not the same effect as mentioned in the original article but it might be of interest.
Interestingly they report no correlation with flu. This might be because the H1N1 seems to have a low number of severe cases & thus a lower number of cases of fever but that's just my impression.
Also a severe fever resulting in a still birth would be more likely early on. I wonder what the data looks like divided into 3 month cohorts.