(This isn't what I originally had planned for Fanservice Friday. I was watching Full Fullmetal Alchemist: Brotherhood episode 27 this morning when I saw this.)
Like, okay, when did Winry get a boob job? Did the animators lose her model sheets? It's like I'm looking at a completely different character; I don't recognize this person! Did Winry have a sudden growth spurt? I like boobs as much as you do but I like it even more when artists resist the urge to draw them so big, you know? I respect that kind of restraint.
Maybe she's born with it, maybe it's automail?