Marteinsdottir I, Sydsjö G, Faresjö A, et al. - Via performing prospective cohort study from gestational week (GW) 26, at childbirth and postpartum, researchers assessed hair cortisol concentrations (HCC) monthly in pregnant women. In addition, they determined the effect of parity. An increase in HCC was noted in both primi‐ and multiparae throughout pregnancy. Multipara had decrease in these concentrations 3 months prior to childbirth. All estimates of HCC in pregnancy and postpartum displayed a significant correlation between HCC for a specific month and the HCC in the previous month, except for the correlation of HCC among primiparae in GW 22‐25 and three months prior to childbirth. Results here suggest that multiparous women have a quicker suppression of the hypothalamic CRH (corticotropin‐releasing hormone) production by placenta CRH.