What is emotional regulation? Why is it important in early childhood? Discuss how

 a) physical (e.g., body and brain),

b) cognitive (e.g., thinking, theory of mind, executive functioning), and 

c) psychosocial (e.g., self-concept, rough and tumble, sociodramatic play) domains contribute to emotional regulation. Include specific developmental concepts for each domain, describe how they apply, and give relevant examples from early childhood (3- to 6-years-old).