Previous research suggests that a mismatch between parents’ birth expectations and experiences is associated with lower levels of birth satisfaction and an increased risk for childbirth-related posttraumatic stress disorder (CB-PTSD; Webb et al., 2021). However, there is a lack of prospective studies and studies investigating expectations and experiences of birth companions. The current study aims to examine whether a mismatch between birth expectations during pregnancy and experiences at two weeks postpartum predicts CB-PTSD symptoms at six weeks postpartum. This will be investigated individually for mothers and birth companions, as well as within dyads of mothers and their birth companions. Webb, R., Ayers, S., Bogaerts, A., Jeličić, L., Pawlicka, P., Van Haeken, S., ... & Kolesnikova, N. (2021). When birth is not as expected: a systematic review of the impact of a mismatch between expectations and experiences. BMC pregnancy and childbirth, 21(1), 1-14.