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 initial action?

Advise the client to seek help from family members to reduce stress and manage the baby's care.

Encourage the client to rest whenever the baby is sleeping to alleviate fatigue.

Assess the client for further signs of postpartum mood disorders.

Reassure the client that these feelings are normal and will subside in a few days.