The interrelation between exposure to trauma, posttraumatic stress disorder (PTSD), and regulatory functioning in children is gaining increasing attention. This study examines the effects of maternal posttraumatic symptoms (PTS) on child deficits in sensory regulation, behavior regulation, and executive functioning. The sample at the first measurement (2011, T1) included 382 Israeli mothers and their young children (child's mean age = 3.89 years; SD = 1.26), and 240 of them were reassessed after 4 years (2015, T2). Mothers self-reported their trauma exposure and posttraumatic distress symptoms (PTSD) and filled out questionnaires on their children's sensory regulation (new version of the Short Sensory Profile including sensory processing and behavior regulation as well as their level of executive functioning (Dysexecutive Questionnaire). A path model showed that maternal PTS at T1 predicted maternal PTS at T2, which in turn was associated with problems in their children's sensory regulation, behavior regulation, and their level of executive functioning. These results highlight the relationship between mother's posttraumatic distress and her child's regulatory functioning. The study supports the construct of relational PTSD and broadens it to additional aspects of children's deficits in sensory regulation, behavior regulation, and executive functioning. (PsycINFO Database Record (c) 2020 APA, all rights reserved).