He and his wife Kayla announced the arrival of Krew Aron Harper in an Instagram post on Monday morning.
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Their son was born on Thursday. He weighed in at seven pounds, nine ounces and was 19 inches long.
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Harper and his wife, Kayla, announced in early April they were expecting a boy.
Harper made the announcement on Instagram as well, featuring two photos - one of Bryce and his wife, Kayla, under the Ben Franklin Bridge, and the other of a sonogram image on top of a little Phillies jacket.
The caption of the post reads: "Philly raised little man will be! #BabyHarper"
Bryce Harper left for paternity leave last week. He has been reinstated, and Maikel Franco has been optioned to Triple-A Lehigh Valley.