All over the world, children with intersex traits are being operated on to be sex assigned at birth - sometimes with devastating consequences. The UN says as many as 1.7%% of the world have intersex traits - that's the same as the number of people with red hair. All over the world, children with intersex traits are being operated on to be sex assigned at birth - sometimes with devastating consequences. Megha Mohan explores the hidden world of intersex children.