A nurse is caring for a postpartum client who reports feeling anxious, irritable, and unable to sleep despite extreme fatigue. The client also expresses feelings of inadequacy as a mother. Which of the following nursing interventions is the most appropriate?

A. Advise the client to seek help from family members to reduce stress and manage the baby's care – While social support is helpful, it does not directly address potential postpartum mood disorders, which require further evaluation. B. Assess the client for further signs of postpartum mood disorders – These symptoms may indicate postpartum depression, which requires further assessment and potential intervention. Early identification is crucial to ensuring the client's safety and well-being. C. Reassure the client that these feelings are normal and will subside in a few days – While some mood changes are common postpartum ("baby blues"), the intensity of these symptoms may indicate postpartum depression, which requires assessment. D. Encourage the client to rest whenever the baby is sleeping to alleviate fatigue – While rest is important, it does not address the client's concerns about anxiety, irritability, and feelings of inadequacy, which may signal a mood disorder.