Board Thread:General Discussion/@comment-24184449-20150510214609/@comment-5278765-20150511222144

Well, we don't know precisely when She's Leaving Home ended. She had just had a baby when Alex went to see her there, but at the end of the episode, she operated with Bailey, so there has to have been a gap there, probably at least six more weeks.

Season one premiered in March, but in-universe, it was July, as that's when new classes of interns start.