That is how it was, and none of it was necessary. The circumstances chosen by God with such wilful exaggeration are precisely those which induce premature babies, damaged babies, non-viable babies, handicapped babies, neonatally vulnerable babies, dead babies. This selection of hazard was so gratuitous in its exaggeration, so exaggerated in its precision, so precise in its foetal target, that it must surely be a divine statement about the nature of Christ, and thereby the nature of man. God chose a conception, gestation and delivery which announced his total confidence in the integrity of his own creation. It was a warning to us against the conceits of our own explanation and the hubris within them.
Man has no original sin to be ashamed of, rather a seminal heroism to be realised.
From Nazareth to Bethlehem, God celebrated his trust in man. Now that really is a Christmas message.