A 31-year-old woman presents six weeks after the birth of her first child. She tearfully describes vivid, unwanted images of smothering the baby with a pillow that enter her mind many times a day; she finds them abhorrent and has never wished to harm him. She now avoids being alone with the baby and repeatedly asks her husband to confirm that nothing has happened to him. She enjoys the baby when others are present, sleeps when he sleeps, and there are no abnormal beliefs or perceptions on examination. Which one of the following is the most likely diagnosis?
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