It is obvious from the time Loki learns to walk that she is not going to be very good at it. Normal toddlers fall, and often; she does it more, and longer. She has been practicing at walking for years before she can cross a floor smoothly nine times of ten, even if she does not sprawl completely every time she missteps.
She winces when she trips, not so much out of embarrassment or because she's hurt herself, but because the reactions are never good.
"Falling is not a thing you choose to do," he says, "so it is far less of a disappointment. And Odin's word is law whether it makes sense to little girls or not."
"You cannot be a boy," says Frigg. "And if you were determined to learn sorcery, I am sure I could not stop you. But I am also sure there would be consequences, and perhaps grave ones."