Research on the most sensitive time in gestation for the influence of prenatal stress is inconsistent. It is likely that sensitivity can occur at different times depending on the outcome studied and the stage of development of the relevant brain or other structures. Two studies of schizophrenia found that the most sensitive period was in the first trimester. This is when neuronal cells are migrating to their eventual site in brain, a process previously suggested to be disrupted in schizophrenia. In contrast, two studies of conduct disorder, or antisocial behaviour, found the greatest associations with stress later in pregnancy [∗[26], [33]]. It is clear that these effects are not all over by the first trimester, but this is an area where much more research is needed.