Background This study investigated the association between worrying about own children and low psychological well‐being during the year that follows breast cancer. Methods In an observational population‐based study, we collected data from 313 women operated for breast cancer at Sahlgrenska University Hospital in Gothenburg, Sweden. Results Worrying about one's own children (3–7 on a 1–7 visual digital scale) was, among other variables, significantly associated with low psychological well‐being 1 year after breast cancer surgery (relative risk 2.63; 95% CI 1.77–3.90; posterior probability value 98.8%). Conclusions In this group of women operated for breast cancer, we found an association between worrying about one's own children and low psychological well‐being. In a healthcare system where resources are scarce, it becomes imperative to identify to whom resources should be directed. Therefore, we may consider prioritizing psychological interventions for mothers with younger children and develop effective means to communicate about issues related to the children to increase chances of an effective, successful rehabilitation.Copyright © 2013 John Wiley & Sons, Ltd.