Changelings are faeries that look like a baby to an extent. According to common myth the child was removed from the crib, often by the faerie, for something resembling a baby, so the faerie could put one of their spawn among humanity and have a human baby to raise themselves. They can control vessels that look like mothers to move around.
They look like babies that were far from perfect. A little too hairy, with ears pointed at the tips, a little too intelligent in how their eyes moved. Eyes like a cat’s or a dog’s, with barely any whites.