They don't usually outgrow a feeding per se...more that the feedings all start stretching out. So you'll likely notice that she can go 3 hrs, then 3.5 most days, then 4...rather than suddenly not want the midafternoon feed, if you see what I mean. This generally happens as they extend their awake time. They can stay awake longer, still sleep for 1.5-2 hrs for quite a while, so they start going longer between feeds.