Background: Having a baby is associated with a variety of stressors, change, and adjustment. This study aimed to identify what women find stressful during the early postpartum period in contemporary Western society. Methods: Women (n = 148) 6-12 weeks postpartum wrote anonymously about a situation they found stressful as part of the Health after Birth Trial (HABiT) of expressive writing. Transcripts were analyzed for categories of stressors and cross-cutting themes. Results: Five categories of stressors were identified. Stressors in pregnancy, labor, and the early postpartum period (49.3%) included physical and emotional difficulties, and insensitive treatment by health professionals. Stressors related to adjusting to life with a baby (35.8%) included difficulties coping with a new baby, parenting, juggling responsibilities, changes to physical health, and loneliness. Stressors related to the baby's health (32.4%) included infant digestive problems, acute health problems, long-term impact, and neonatal intensive care unit experiences. Stressorsrelated to breastfeeding (23.7%) included pressure to breastfeed, feeling like a 'bad mum' for not breastfeeding, or wanting to breastfeed and not being able to. Other stressors related to changing relationships (18.2%): with their partner, children, and other family members. Cross-cutting themes that emerged in different stressor categories were women making negative self-appraisals (eg, a bad mum, failure), feeling guilty, and lack of support from others. Discussion: Our findings emphasize the importance of exploring stressors and psychological well-being with women to provide support, help women's adjustment postpartum, and ensure interventions are offered when appropriate.