A considerable body of research indicates that children's executive function (EF) skills and related school readiness constructs are important for early learning and long-term academic success. This review focuses on EF and a related construct, motor skills with a focus on visuo-motor integration, as being foundational for learning, and describes how these skills co-develop in young children in bidirectional and synergistic ways. The review discusses definitional and conceptual issues, connects EF and visuo-motor integration to relevant theoretical perspectives, discusses measurement issues and advancements, and reviews intervention evidence to support the malleability of these skills in young children. Discussion emphasizes how these skills develop together and suggests that research examining children's learning from a co-development perspective can help promote children's health and well-being. [This paper was published in "Early Childhood Research Quarterly" v46 p142-151 2019.]