On a summer day in 1951, two baby girls were born in a hospital in small-town Wisconsin. The infants were accidentally switched, and went home with the wrong families.

• Host Ira Glass introduces four characters: Kay McDonald, who raised a daughter named Sue, and Mary Miller, who raised a daughter named Marti. In 1994, Mary Miller wrote letters to Sue and Marti, confessing the secret she'd kept for 43 years: The daughters had been switched at birth and raised by the wrong families. This week's entire show is devoted to the story of Mary Miller's secret and what happened when both families finally learned the truth. (6 1/2 minutes)
• Act One: Reporter Jake Halpern tells the story of Marti Miller and Sue McDonald, the daughters who were switched at birth, and the many complications that came with learning the truth. Jake is a writer of several books and creator of the comic, "Welcome to the New World.” (26 minutes)
• Act Two: Jake Halpern tells the mothers' sides of the story. At 69, Kay McDonald had to cope not only with the news that her daughter wasn't her own, but that another mother had known the whole time. And Mary Miller explains why she was tormented by her secret but unable for decades to share it. (26 minutes)

Transcripts are available at thisamericanlife.org

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