In Christianity miracles are seen to be these glorious gifts from God, and let's all just admit it that in The King of Tars, when that baby was born they surely needed something.
The baby that was born in the King of Tars was this lump, (still unsure what it would look like but I'm going with this fleshy little ball that if you dropped it and a hill was around, it'd probably roll.) and the sultan and the princess decided to have this pray off to see whose God would come through and make their baby a human.
|King of Tars, Sultan praying to the idols.|
So the Sultan prays to his idols and Gods to help his son and nothing happens and he gets angry and breaks the idols. The Princess has a priest come and he baptizes the baby and the next thing we know boom a miracle. The baby has flesh, a face and limbs. We have a real life baby. The miracle gives the Sultan and the Princess a child and convinces the Sultan to forsake his religion and convert to Christianity, which for the Princess is a miracle in itself.
The actual transformation of the child is a divine vision of the miracle performed and is often used to bring the reader in and used for conversion purposes. It takes things that are seen as monstrous and dangerous and through faith and God brings it to something that is miraculous.
When looking to the miracle it also seems to protect the protagonist because the baby links her to witchcraft and evil entities with the devil and by the miracle she's able to turn it to good and use it towards her cause of not only converting others to Christianity but saving her child and in the end her husband.