Indigo Child is a term coined by Nancy Ann Tappe and it's how she and others now classify a "new breed of children" by personality type and personal characteristics.
According to Tappe, Indigo Children are "Extremely bright, precocious children with an amazing memory and a strong desire to live instinctively, these children of the next millennium are sensitive, gifted souls with an evolved consciousness..."
Indigo Children are said to display the following characteristics; (from indigochild.com)
Believers in the concept of The Indigo Child maintain that these children are born with an "empathic connection to Earth and others' thoughts." but that traditonal parenting methods of dicipline, Indigo Children's proported abilities (empathy, telepathy, extra-sensory perception and extra-normal perception) are suppressed by negative influences as parents strive to make these unique children fit in the 'normal child mould'
Those that support the theory of Indigo Children encourage parents to support traits which are often labeled as negative by mainstream authorities but as positive by Indigo Child theorists. Many Indigo Child theory supporters believe that these traits can also be brought out in non-Indigos, but that Indigo Children are predisposed to them thanks to an evolutionary advantage.