"Parental depression, maternal antidepressant use during pregnancy, and risk of autism spectrum disorders: population based case-control study" 
BMJ April 19
http://www.bmj.com/content/346/bmj.f2059
"Conclusions In utero exposure to both SSRIs and non-selective monoamine reuptake inhibitors (tricyclic antidepressants) was associated with an increased risk of autism spectrum disorders, particularly without intellectual disability. Whether this association is causal or reflects the risk of autism with severe depression during pregnancy requires further research. However, assuming causality, antidepressant use during pregnancy is unlikely to have contributed significantly towards the dramatic increase in observed prevalence of autism spectrum disorders as it explained less than 1% of cases."