Part of the Afon Babi (river of the baby). A local tale tells of a ‘changeling’- a fairy child left in place of a human child stolen by the fairies.
In Wales it was thought that a changeling child, ‘plentyn cael’, resembled
the human it substituted at first, but then it gradually grew uglier in appearance and
behaviour. It was given to screaming and
biting. It could be identified by its more than childlike wisdom and cunning. It seems that the way to identify a changeling was to cook a family meal in an eggshell.
The changling would exclaim, “I have seen the acorn before the oak, but I
never saw the likes of this,” and then vanish, only to be replaced by the
original human child.