Some quick news for you today, courtesy of Mike Vassallo:
This has been planned for a few days, with the plan for their child to be born on Thursday. Nothing to worry about here, Aoki will miss up to three games while he is away, and considering the schedule, I wouldn't expect to see Aoki back until Friday at the earliest, and probably not until Saturday.
To fill his roster spot, Josh Prince was also recalled from Triple-A Nashville. This will be Prince's second time with the team this season, as he spent a month with the team while Aramis Ramirez was injured. He only made six appearances with the team during that time, three times as a pinch runner and three times as a late defensive replacement. Caleb Gindl will probably get the next few starts while Aoki is out, with Josh Prince providing outfield depth in case of emergency.