The Nationals placed right-handed reliever David Carpenter on the paternity list Monday and recalled left-hander Sammy Solis to take his place. Dale Zanine/USA TODAY Sports

The Nationals placed right-handed reliever David Carpenter on the paternity list Monday. Carpenter left the team to be with his wife, Brittny, who gave birth to the couple’s first child, a son, on Monday afternoon. The Nationals recalled left-hander Sammy Solis from Class AA Harrisburg to take Carpenter’s spot.

Carpenter’s family lives in West Virginia, a couple hours’ drive from the District. The paternity list allows a player a minimum of one day and a maximum of three days away from the team. The Nationals acquired Carpenter from the Yankees in early June, and he has slotted into a late-inning role, appearing in eight games and pitching to a 1.50 ERA in six innings. Veterans Matt Thornton and Casey Janssen will likely secure the eighth inning in his absence. With Solis on the roster, Blake Treinen can also fill that role, as Solis provides a middle-relief alternative behind him.

Solis pitched nine innings in his first stint with the Nationals, including six scoreless to start his major league career. He was called up from Harrisburg in May, then was placed on the 15-day disabled list with shoulder soreness. When he returned, he was optioned back to Harrisburg. This is his second big league stint. The Nationals have a day off Thursday, so Carpenter could return as late as Friday in Baltimore.