All About Changelings

Throughout the world there are sinister stories of children not just being abducted, but switched with strange impostors. Parents would find their baby child had been replaced by odd beings who were almost but not quite human. Often changelings are described as being ugly and wizened, while others appeared normal but demonstrated weird abilities such as being able to stretch their limbs at will. However strange appearances aside it was their behaviour that marked them out - changelings were said to be either extremely badly behaved - constantly crying and prone to violence, or at the other end of the spectrum strangely docile, often mute and seemingly unable to comprehend anything about the human world they had been left in. Another common characteristic to changelings was an insatiable hunger - a changeling could eat a family out of house and home, a troubling prospect as some changelings were believed to never grow up, constantly needing care and food, while others were said to be extremely long lived, possibly even immortal, being a burden on whole generations of families.
There were several theories about why changelings were left. In the case of changelings that were said to be wizened and sickly, it was said that these creatures were actually ancient, elderly faeries, left by their compatriots to enjoy the love and comforts of a human family in their dotage. Other changelings were so infirm that they soon sickened or died, leading to folk beliefs that the impostor had been nothing more than a magical fake, such as piece of rotting wood crudely enchanted to mimic a human child. Still others believed that the faeries were so badly behaved that their parents sent them to the mortal world until they grew up and became less troublesome, tying them to their mortal homes and limiting their power until both their mortal parents died.
And why did the faeries steal children? Well, some traditions held that the faery folk were an old, dying race who sought new blood to strengthen their numbers. However other traditions had darker ideas - the human children were to be used as servants and slaves in their other world. Worse still, some traditions held that the faeries owed a tithe of souls to Hell, and hence they stole human children to pay the debt to the Pit. On a similar note, some folk beliefs held that changelings were mere sent to vex mankind, and in tales of particularly violent or troublesome changelings, they were said to have been left by witches or the Devil himself to increase the sum of human misery.
Now there were many regional cures, often involving some local place, such as bathing the child in the nearby holy wells, visiting a shrine or taking it to standing stones. But there are three main ways of dealing with a changeling that occur time and time again in many different countries and cultures. The first is basically to abuse the child, often beating it with sticks, with the idea being that the changeling's real parent - the faeries or the Devil - would promptly appear and give back your own child to prevent further cruelty to their own. In a similar fashion, placing the changeling either in a fire or a hot oven would cause the malign being to take its leave, often said to fly off up the chimney, and your own offspring would be returned. Sadly however these two methods rarely resulted in happy endings, and indeed in the 18th and 19th centuries we begin to find parents and guardians appearing in court on charges of cruelty, neglect, and murder of their own children who they believed to be changelings.
However thankfully there was a third method of dealing with a changeling which while probably ineffective in the real world, at least did not involve cruelty to the suspect child. And what's more, it is somewhat amusing - indeed it is the basis for many of the more entertain changeling folk tales. This third method was based around the premise of tricking the changeling into revealing its true nature, and once its cover were blown, the faeries had to return the real child. And weirdly enough there was an exact way to do this which is recounted in many different countries. Basically in full view of the changeling child one had to cook using eggs - but these was not merely whipping up a quick omelette, rather you had to brewing beer or make stew using the egg shells as tiny containers. This culinary performance was said to be sufficiently surreal and bizarre to make the changeling reveal its true nature,with old folk tales holding that the creature would suddenly sit up, exclaim that it had never seen anything like it in its long and strange life.
And then, having revealed itself as an impostor the changeling would vanish - or again fly off up the chimney - and the stolen child would be magically returned. Quite why this egg based method is so widespread is something of a mystery. Possibly there is a forgotten symbolic significance to eggs in this context - and certainly they seem appropriate given that one can draw parallels between the concept of changelings and the behaviour of birds like the cuckoo which leaves its eggs in other birds' nest to raise as their own.