Case study: 'My son was six when he first demanded a sex change'
Nicki was born a boy but as early as 18-months-old, she was already trying on her mother's dresses and underwear.

By Richard Alleyne, Science Correspondent 7:00PM BST 15 Apr 2011

http://www.telegraph.co.uk/health/healthnews/8454231/Case-study-My-son-was-six-when-he-first-demanded-a-sex-change.html

At nursery, she shunned boys' games and preferred to play with the girls.

By four, Nicki was telling her mother Sharon, an IT manager, that "God made a mistake by making me a boy".

Two years later, she was already asking for a sex change operation.

It was at this point that Sharon, now 42, decided to attend the Gender Identity Development (GID) service at the Tavistock and Portman mental health trust in North London.