Michelle Obama reads in her upcoming memoir "Becoming": NPR

Michelle Obama's new memoirs To become, about his childhood life through the years of the White House, comes out Tuesday. NPR received Monday an exclusive listening of two parts of the audiobook, read by Obama herself.

In the first, Obama focuses on his impressions of Princeton, his minority and his university life. "We were hoping that we all went together in a heterogeneous harmony," she says of the university's vision for the different races. But, she says, the burden has been placed on the students of the minority.

In the second excerpt, Obama reads the period during which her husband, former President Barack Obama, was a senator from Illinois and was trying to start a family. "I treated it as a mission," she says. "Despite all our efforts, we could not conceive of a pregnancy." She had a miscarriage and, later, the couple conceived their two daughters by IVF.