Updated at 6:29 p.m.
The Nationals have placed shortstop Ian Desmond on the newly created paternity leave list and recalled outfielder Roger Bernadina from Class AAA Syracuse to temporarily take his roster spot.
Desmond's wife, Chelsey, had been due to give birth to the couple's first child in Sarasota, Fla., and the Nationals had been prepared for the shortstop's departure for the last week. Grayson Wesley Desmond was born at 3:56 p.m., weighing 6 pounds, 11 ounces.
Major League Baseball created the paternity leave list this season, allowing expectant fathers to come off the roster for up to three days, with a replacement promoted from the minors to fill that spot. Desmond becomes the second big-leaguer to go on the list, joining Rangers right-hander Colby Lewis.
Desmond has gotten off to a sluggish start to the season, hitting .205 with two homers and eight RBI over his first 20 games. He's also committed seven errors, tied with Cubs shortstop Starlin Castro for the major-league lead. He's expected to miss tomorrow's game but could return in time for Thursday's series finale against the Mets.
Bernadina was hitting .267 with one homer and two RBI in 13 games at Syracuse. The 26-year-old outfielder missed the season's first week while tending to a family matter.
Though Bernadina isn't expected to be in the Nationals' lineup before Desmond returns, he may get a chance to stick around for a little while longer. The club could choose to send infielder Brian Bixler back to Syracuse when Desmond returns and keep Bernadina until Ryan Zimmerman is activated off the disabled list.