“The second person of the Trinity was conceived and born needing the care of a mother. To be human is to be vulnerable, but to be a baby is to be vulnerable in a manner we spend a lifetime denying. Indeed Jesus was a baby refusing to forego the vulnerability that would climax in his crucifixion. And as such, Jesus was entrusted to the care of Mary and Joseph. They could not save him from the crucifixion, but they were indispensable agents to making his life possible.” -Stanley Hauerwas
BTW NOTE: “Indispensable” is difficult word to use here. Could God have sent his Son differently? Yes, probably, but by sending him in the way that he did, Christ identified with true human beings who are dependent creatures from birth.