Very pretty! But if that spider is 3 months old, I'll eat my shorts. I have one about 7 months old that is about 1/4 that size (actually it's about the size of a quarter, lol), this species isn't a particularly fast grower, you couldn't get one to that size at 3 months even if you powerfed the crap out of it. Most of them mellow out into very calm adults, just don't let him scare you and you'll be fine; remember it's a cycle, the tarantula twitches, you jerk, the tarantula jerks, etc etc. Move slow and calm and she will too!