“…Most studies continue their follow-up until the age of six months, while some studies continue the follow-up study until 10 months (Braeken et al, 2013;Peltola et al, 2017;van den Heuvel et al, 2015b), 24 months (Blair et al, 2011;Stroustrup et al, 2016) or 36 months (Bekkhus et al, 2011;Lin et al, 2017;Stroustrup et al, 2016). As was seen in earlier studies (Räikkönen et al, 2011) and regardless of the kind of measurement of temperament or its timing, most evidence points to associations between prenatal stress and high scores on two partially overlapping temperament traits: namely, negative affectivity (sadness, distress to limitations, fear, discomfort, and anger) (Blair et al, 2011;Braithwaite et al, 2013;Green et al, 2016;Hill et al, 2013;Huynh, 2014;Lin et al, 2014;Nomura et al, 2014;Peltola et al, 2017;Pluess et al, 2011;Rouse and Goodman, 2014;van den Heuvel et al, 2015b;Zande and Sebre, 2014) and "difficult temperament" (negative affectivity, intense reactions, slowness in adapting to new situations and irregular routines; Chong et al, 2016;Della Vedova, 2014;Green et al, 2016;Lin et al, 2017;McMahon et al, 2013;Rode and Kiel, 2016;Stroustrup et al, 2016). In a very large-scale study (Bekkhus et al, 2011), child's crying behavior and aggressive behavior were highest if the mother showed high anxiety and depression both during and after pregnancy, while maternal symptoms that lasted during pregnancy only were not associated with child aggressive or crying behavior at age 3 years.…”