It's the first question asked after the birth of a baby. But sometimes the answer isn't obvious? In about one out of every 1,500 births a child is born so noticeably atypical in terms of genitalia that a specialist is called in. Out of every thousand birth one to two children have traditionally been exposed to surgery to "normalize" the appearance of their genitals. Even more people are born with subtler forms of sex anatomy variations some of which won't show up until later in life.