Indigo are born with wisdom. It can be seen by the way they see people, problems, and the world. Usually they have keen eyesight that make them looks like searching other people deepest secrets.
Lots of parents have troublesome problems with indigo children, just because they have different point of view from their children. Indigos feel and know how they should works and get things done their ways, they don't like being told by their parents.
Some indigo have psychic abilities, that let them be able to do mind-reading, seeing the future, and even speaking to spirits