Some studies have found an association between prenatal stress and increased risk of autism [[21], [37]], with exposure in mid- to late-gestation, although a large population study has failed to confirm the increased autism [38]. Two studies have found an increased risk of schizophrenia in adults born to mothers who experienced stress during pregnancy. Both showed effects with severe stress, the death of a relative [16] or exposure to the invasion of the Netherlands in 1940 [22], and both showed that the sensitive period of exposure was during the first