This article discusses the psychosocial development theory by Erik Erikson and Urie Bronfenbrenner's bioecological development theory. It explains the role of parents and nurses in child development, specifically during the stage of 'muscular-anal' between the ages of 2 and 5 years. The article also covers the normative and non-normative events during this stage, the impact of the child's microsystem on their development, and the consequences of fixation at this stage. The nurse's role in recognizing and supporting the parent and child is also discussed.