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8/2/2013 9:25 P.M. ET

O'Sullivan returns to Padres, heads to bullpen

SAN DIEGO -- Padres pitcher Sean O'Sullivan had a huge smile on his face when talking about his new baby girl, Hailey Marie, who was born Wednesday.

"Most intense moment I've ever been a part of," O'Sullivan said. "That was something special, man, really puts things in prospective."

The baby and O'Sullivan's wife, Sabrina, arrived back home and healthy on Thursday afternoon. The baby was 8 pounds, 11 ounces and 19 inches long.

"They are at home now relaxing, trying to catch up on some rest," O'Sullivan said.

He will also have to prepare for a transition to the bullpen. The Padres traded for Ian Kennedy, and he will take O'Sullivan's spot in the rotation.

With Tyson Ross in the rotation, O'Sullivan could serve as one of the long relievers in the Padres' bullpen along with Tim Stauffer.

"As with any reliever, you have to come to the park ready and have a bit of resiliency," said Padres manager Bud Black. "It'll be a little bit of a mind shift for him."

Kennedy joins Padres, set for Sunday start

SAN DIEGO -- Sitting on the floor next to the locker of newly acquired Padres starter Ian Kennedy was his travel bag to carry all his stuff, with a D-backs logo on it.

Someone will have to get him a new one.

Kennedy arrived at Petco Park for the first time as member of the Padres on Friday. He was traded from the D-backs hours before Wednesday's non-waiver Trade Deadline.

He will make his first start for the Padres on Sunday, and he admitted it was a little strange to look down and see a blue uniform.

"You work so hard with the team you're with and then you get traded," Kennedy said. "But I'm excited because I got to come to a team that I'm familiar with, a division that I'm familiar with -- kind of a little mixed emotions."

Even more strange for him is that his first Padres start will come against the Yankees, another one of his former teams. Prior to Friday's game, Kennedy chatted with some of his former teammates from the Minors while he was in the Yankees' organization.

"It's kind of ironic," Kennedy said. "Kind of come a little full circle."

Kennedy said he's had a chance for a few conversations with some of the Padres' players -- including Chase Headley, Yonder Alonso and some of the other pitchers during workouts -- but hasn't gotten around to meeting everyone yet.

Hours before Wednesday's Trade Deadline, the Padres sent left-handed reliever Joe Thatcher, Minor League right-hander Matt Stites and a 2014 Competitive Balance Round B Draft pick to the D-backs for Kennedy.

"To get a pitcher like that, a strike-thrower that has that presence, that gives the ballclub a good feeling," said Padres manager Bud Black.

It's also the second time Padres general manager Josh Byrnes and assistant general manager A.J. Hinch have traded for Kennedy. They were with Arizona when they acquired him from the Yankees in a three-team deal in December 2009, and Hinch was the D-backs' manager for parts of '09 and '10.

"[Byrnes] mentioned that I'm the first guy he's traded for twice," Kennedy said with a laugh. "Somebody likes me."

Short hops

• Black said left fielder Carlos Quentin's left knee was "doing better" before Friday's game against the Yankees, but he wasn't in the starting lineup. Quentin tweaked the knee on Saturday against the D-backs and then didn't play in Wednesday's loss to the Reds. The hope was that getting that day off, followed by Thursday's off-day, would be enough to get him back in the lineup. Black did not rule out Quentin entering Friday's game at some point.

"We're hoping he's in there at some point," Black said.

• This series against the Yankees is just the second series Black has managed against them. The first was in 2008 at the old Yankee Stadium. He said before Friday's game that he was happy the fans in San Diego got the chance to see the Yankees in their first visit to Petco Park and first trip to San Diego since 2002.

"I think this is great for San Diego," Black said. "This is what the Interleague decision was all about and this is great for our fans to see such a storied franchise."

Jamal Collier is an associate reporter for MLB.com. Corey Brock is a reporter for MLB.com. Keep track of @FollowThePadres on Twitter. This story was not subject to the approval of Major League Baseball or its clubs.