Which intervention is most effective in encouraging a postpartum mother with little interest in caring for her infant?

The most effective intervention in this scenario is encouraging the postpartum mother to take pain medication as prescribed. After childbirth, women often experience significant physical discomfort, which can affect their emotional state and overall engagement with their newborn. Pain can lead to feelings of exhaustion and overwhelm, making it difficult for a mother to focus on bonding and care for her infant.

By ensuring that the mother is comfortable and managing her pain effectively, she may experience an increased capacity to interact with her baby. Alleviating physical discomfort can help improve mood and motivation, fostering a more positive environment for both mother and child. Addressing physical needs first is crucial, as it lays the groundwork for addressing emotional and psychological wellbeing, facilitating better maternal-infant interactions.

Other interventions may not directly address the underlying issue of pain and discomfort, thus potentially prolonging the mother's lack of interest in her infant. Therefore, managing physical pain is a foundational step in supporting maternal bonding and care.