What is gender identity?

http://www.health24.com/sex/Sexual_diversity/1253-2444-2900,32546.asp
10/14/2008

When a child is born, the midwife or doctor looks at the baby's genitals and declares it a boy or a girl accordingly. In most cases, this method of assigning gender at birth fits the person without any problems. However, a person's gender is actually quite complicated and as a result this simple method of assigning gender doesn't always work.