This week is a bad one for children at Seattle Grace -- well, ultimately good for most of them, but bad that they are all patients to begin with. Hunt pages Callie in the middle of the night to help treat a teenage girl who, while tripping on mushrooms, fell off the roof of her house and broke 52 bones. Okay, so technically it's 52 breaks, so I suppose that some could be bones with multiple fractures but the bottom line is, she's a sack of twigs now. She's also a complete pill, as the docs witness her talking back to her parents when they find out about the mushroom component of the fall. She brags about how she's the perfect child except for this, and so they should be happy, and once in surgery, Cristina admits that she could get away with doing or saying almost anything since she was also a crazy high achiever and perfect student. Avery seems to like this since he was the same way, and he likes it even more when in the middle of surgery, Cristina goes against protocol and Hunt's direct order to take care of a cardiac complication. Hunt goes ballistic, but Avery finds it so hot that he gets drunk and tries to make out with her. She's so mad at Hunt and her ego is so stoked that she's into it for half a second, but then decides better of it -- you see, Meredith earlier said he might have a point to be mad and that also his being mad proves he loves her. Cristina seems to really absorb this, and so she goes to talk to him and actually apologizes, and they go home together.

Avery isn't the only one with a thing for their merger buddy -- as set up last week, Reed has the hots for Alex. He's still upset about the Izzie situation, which goes from bad to worse when the Chief gives him her outstanding $200,000 hospital bill since no one can reach her. His patient is a preemie who he expects to die, but between the baby's mother freaking out at the idea that she could die before she's ever held (Mom has just had her own surgery and can't be moved to see her baby) and Alex having essentially nothing left, he's moved to pick up the tiny baby once he's alone. Bailey finds him and realizes that his touch is helping the baby's vitals, and has him take off his shirt so he can give skin-to-skin contact. I promise this is an actual medical thing -- Kangaroo Care -- but it's also a good excuse to get Alex out of his shirt and send Reed (and I'm sure a good amount of the viewing audience) all aflutter. By the end of the day, when Alex is out of fight and admits he's got control over nothing but sitting there and holding the baby, he seems to allow Reed to sit with him for a little while.

But the main story of the hour is Arizona and her awesomely cute and sweet 10-year-old patient Wallace. He has a terminal condition and was expected to die but under Arizona's care got a couple of extra years out of his life. His wealthy parents are so thrilled that they tell Arizona, Richard and Jennings that they are donating 25 million dollars to the hospital. When Wallace takes a turn for the worse, Arizona realizes that this time his life really is nearing its end, but his parents want him to have another surgery if it could buy another couple of months. Arizona is adamant that Wallace isn't strong enough but Richard, blinded by the dollar signs in his eyes, urges her to move forward with it. She does the surgery, and Wallace lives... only to go into septic shock a few hours later. Arizona rushes back into surgery, where she gives the Chief an awesome telling-off for his money-hungry idiocy, but she can't save the boy, and she opts not to be the one to tell the parents since she knows she'll admit they never should have done it, and invite a lawsuit. Jennings and Richard chase after the parents and kiss their asses, but as they are packing up Wallace's things Arizona comes in and speaks to them after all. Richard even tells Jennings to shut it when Jennings gets worried about what she might say. Arizona gives the couple a chance to say goodbye to their son, and they are so moved by her genuine caring that the dad tells them all he's still donating the money, but solely because of Arizona and not because of Greedy and Greedier. It's a nice end to what turns out to be Arizona's (and Wallace's) birthday -- much nicer than the unwanted and ill-timed surprise party that Callie tried to throw -- and when Arizona comes home that night to find Callie, knowing she was dumb and really sweetly all ready to celebrate along, the two finally exchange "I love yous."

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