What are the underlying assumptions about child development in Mrs Winger's comment?

Mrs. Winger's comment likely assumes that child development is a linear process, where specific skills or behaviors should emerge at predictable stages. It also suggests that there is a "norm" for development that all children should adhere to, implying that deviations from this norm may indicate a problem. Additionally, her perspective may reflect a belief in the importance of external factors, such as parental involvement or educational practices, in shaping a child's developmental trajectory.