Who is This Kid?

We've just celebrated the coming of our God as a vulnerable little child; an incredible incarnation.  Our God with no real need for a body, chooses skin like ours and chooses all the growing pains and weirdness of adolescence.  Our God, knower of all things, chose to come learn from us. How does that even work? How can Jesus as a child sit at the feet of human teachers to learn but at the same time have full knowledge that the creator of the universe is his Holy Parent?