The team didn't say how long Harper will be gone. He and his wife, Kayla, announced on March 26 that they were expecting their third child.
The 31-year-old Harper is on a six-game hitting streak, batting .381 during that span. He played his 600th game with the Phillies on Friday.
To take his place on the 26-man roster, Philadelphia promoted infielder Kody Clemens from Triple-A Lehigh Valley.
The 27-year-old Clemens has hit .270 with three home runs, 11 RBIs and 13 runs in 16 games with Lehigh Valley.
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AP MLB: https://apnews.com/hub/MLB