A nurse is reinforcing teaching with the mother of a toddler who has acute nephrotic syndrome. The nurse should emphasize the need to report which of the following manifestations to the provider?

A. Poor appetite: Poor appetite is a common symptom in nephrotic syndrome but is not immediately life-threatening or an urgent concern. B. Facial edema: This can indicate worsening fluid retention or disease progression, requiring immediate evaluation and possible adjustment in treatment. C. Yellow nasal discharge: This likely indicates a mild upper respiratory infection, which is not directly related to nephrotic syndrome. D. Irritability: Irritability is non-specific and can occur in various pediatric illnesses but is not an urgent manifestation.