could be true. a dog with a perfectly shaped heart on his fur turned out to be true…of all the marks in the world, some are going to look like other things. hoax or miracle? neither. coincedence.
There is a huge difference between a mark that looks like a heart compared to a whole series of exact detailed reproductions of Quran verses appearing and disappearing. That pushes it to such far extermes of coincidence that it can’t really be coincidence. And I really doubt that Allah would go around making verses appear on some baby, so that leaves hoax.