A nurse assesses 4 children. All of the children are experiencing regression. Which of the following children should the nurse be concerned about?

Rationale: A. A 3-year-old child who has experienced gross motor regression for six months: Persistent loss of previously acquired gross motor skills over an extended period is concerning and may indicate an underlying neurological, muscular, or developmental disorder. This type of regression warrants immediate further evaluation by a healthcare provider. B. A 1-year-old child who has been waking frequently during the night crying after moving to a new house one week ago: Short-term sleep disturbances related to environmental changes are common in infants and usually resolve as the child adapts. This type of regression is temporary and not immediately concerning. C. A 2-year-old child who has been experiencing regression for two weeks after beginning to attend day care: Brief behavioral or developmental regression due to adjustment stress is common in toddlers starting day care. This regression is short-lived and resolves with adaptation. D. A 2-year-old child who has been hospitalized for cellulitis and is having incontinence resulting in diaper use: Regression in toileting during hospitalization is often a stress response and temporary. It usually resolves once the child returns to a familiar environment and is not indicative of a serious underlying condition.