They present this increased risk as a percentage. No-one understands what that means. People can't translate that increase in risk into actual numbers of people with autism.
Do you have a source for that? Looks like homicide remains the leading cause of death of women during the perinatal period, and in general the greatest risk a pregnant woman faces is her partner.
http://www.ncbi.nlm.nih.gov/pubmed/22015873
http://www.webmd.com/baby/news/20010320/number-1-cause-of-de...
But even in the US suicide is a leading cause of death of women in the perinatal period.
Here's cites for the UK:
http://bjp.rcpsych.org/content/183/4/279
And the WHO lists suicide as a leading cause of death in the Western world, and in the two most populous countries
> Suicide is a leading cause of maternal death in developed countries. The 1997-1999 Report of the Confidential Enquiries into Maternal Deaths in the UK identified psychiatric disorders, and suicide in particular, as the leading cause of maternal death (6). Suicide is now a leading cause of death in young women in the reproductive age group in the world's two most populous countries, India and China
Or read Gerd Gigerenzer's book Reckoning with Risk http://www.amazon.com/Reckoning-Risk-Learning-Live-Uncertain...
https://plus.maths.org/content/reckoning-risk
And, as Temporal says, without knowing the base rate (am I raising my risk from 1 in 100,000 or from 1 in 1,000?) it provides very little useful information.