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04/06/2013 7:35 PM ET

Melvin juggling multiple platoons

HOUSTON -- Scott Sizemore hasn't played since Wednesday, and there's a chance his next start doesn't come until Tuesday.

Such is the life of a platoon player.

Oakland employs several platoons at the moment, notably at second base and catcher, and with the Astros throwing out three right-handers against the A's this weekend, manager Bob Melvin is faced with a tough task.

Melvin started the right-handed-hitting Derek Norris behind the plate on Saturday, after platoon partner John Jaso started the first game, but Eric Sogard remained at second base for a third straight game, with the right-handed Sizemore remaining on the bench.

"It's a little more difficult when you don't have too many left-handers, so we'll certainly sprinkle Derek in there against some right-handers to keep him current," Melvin said. "Once we get to Anaheim, we get two out of three [left-handed pitchers]. You try not to let them go too long without getting them in there, but like any semi-platoon, when you have two guys to split the job, that's part of the task."

Sizemore will pick up at least two starts against the Angels, it seems, with left-handers C.J. Wilson and Jason Vargas scheduled to start Tuesday and Thursday, respectively. Former A's hurler Joe Blanton, a righty, will go Wednesday.

Moss back with A's as wife remains in labor

HOUSTON -- Brandon Moss was back with the A's in Houston on Saturday, but still on high alert with his wife, Allison, expecting to deliver their second son in the Bay Area at a moment's notice.

"It's moving very slowly," Moss said. "[On Thursday], doctors said things were going pretty quick, and then it just stopped. She's still in labor, but we're kind of on hold. He said it could be four hours or four days."

So, Moss took his wife home from the hospital on Friday evening and boarded a flight to Houston on Saturday, just in time to be put in the lineup at first base for the team's second game of a three-game series.

"I kissed her goodbye and told her, 'I love you, but just stay pregnant!'" Moss said, smiling. "She wasn't laughing, though."

"You want to be there, obviously, to support your wife, but here he is," manager Bob Melvin said.

On Friday, the A's had Shane Peterson on hand in the event Moss was placed on the paternity leave list, and he'll likely remain on speed dial until the baby, to be named Brody, does come.

Moss and the A's fortunately return to California on Sunday night, in preparation for a three-game series with the Angels in Anaheim that begins Tuesday, putting Moss within an hour plane ride of his wife, whose due date is April 28. Moss' grandparents and sister are keeping her company for the time being.

"It's best to just come here, and then when everything starts up again, go back," Moss said. "They sent her home to relax, but she started doing laps up and down the stairs to try to speed things up.

"On the way to hospital, I was saying, 'Wow, what a good kid. I didn't have to get on a plane and then get called back,'" Moss said. "But, man, we spoke too soon. He's going to be just like his dad, so stubborn."

Straily optioned to make room for Colon

HOUSTON -- What was made certain Friday night turned official on Saturday when the A's optioned right-hander Dan Straily to Triple-A Sacramento to make room on the 25-man roster for Bartolo Colon, who made his season debut against the Astros.

On the 40-man roster, Colon took the spot of right-hander Will Harris, who was claimed off waivers by the D-backs just three days after the A's had claimed him.

Straily struck out a career-high 11 and allowed just two runs in 6 2/3 innings in Houston on Friday night, numbers that couldn't prevent the inevitable demotion, which the A's had in the works for weeks before Colon's return.

Saturday marked Colon's first big league start since Aug. 18. Four days later, he was hit with a 50-game suspension after testing positive for testosterone.

Worth noting

• Despite his back stiffening in Friday night's game, center fielder Coco Crisp was back in the starting lineup on Saturday, with the team reporting no concern regarding the veteran leadoff man.

"We'll keep an eye on him, but he's OK," Melvin said. "He knows we have some other options here and you don't want to go out there if you're not 100 percent, so he feels good enough to play."

Crisp collected three hits -- a leadoff home run and two fifth-inning doubles -- in Friday's win.

Jane Lee is a reporter for MLB.com. Read her blog, Major Lee-ague, and follow her on Twitter @JaneMLB. This story was not subject to the approval of Major League Baseball or its clubs.