Have you seen the nativity scenes? It's all a bit surreal. Mary has just given birth. And there are cattle and a whole bunch of strangers. It's not really the setting you want for giving birth to a baby.
And then when you consider this baby. The one through whom, by whom and for whom all things were created. The one under whom all things sit. The firstborn over all creation. What? The firstborn? How can he be firstborn if he's only just been born?
In this little baby we have the one who has existed since before the beginning of time. Stuffed into this tiny little flesh suit, is the fullness of God. It's utterly incredible.
Jesus is firstborn over all creation because He will be the first to be re-born, to be resurrected. He will be the proto-type for all his people. The first of all humanity to meet God's standard. The first to live a sinless life.
In this little baby is the power of God.