Promoting science, math, engineering, and technology (STEM) skills for young children provides foundation for and interest in later STEM learning, making early childhood an important time to develop these competencies. Young children also spend increasing amounts of time with media, and thus it is important to understand if children are accessing STEM content and what factors may determine this access. The current survey study of parents of three- to seven-year olds assesses how parents' science self-efficacy and parents' scientific literacy relate to children's STEM media use. Results demonstrate positive relations between parent self-efficacy and child STEM media use (aligned with self-efficacy theory), but results also demonstrate no significant relation between parent scientific literacy and child STEM media use. We conclude that parent self-efficacy is an important social susceptibility for young children's STEM media use and that future research should continue exploring potential interventions for promoting parents' self-efficacy related to teaching their children science.