The Oakland A's reinstated first baseman Brandon Moss from the paternity list and optioned Shane Peterson back to Class AAA Sacramento on Friday.
Moss went on the paternity list Tuesday for the birth of his second son. He is batting .283 with 13 RBI in 13 games.
Peterson went 1 for 7 with an RBI in two starts at first base in Moss' absence.
The A's (12-4) start a series Friday at the Tampa Bay Rays (5-10).