What does androgen insensitivity syndrome mean?

XY baby is a girl: Without testosterone (t), all babies develop as girls. So a child with 1 x & 1 y chromosome, who would normally be a boy, would develop as a girl if no t was present. In androgen insensitivity syndrome, the t is there, but the cells are insensitive to it, and don't respond, so it's as if the t was not there at all. So an xy genetic boy baby is born looking like a normal healthy baby girl.

A.I.S. Defined: Androgen insensitivity syndrome (ais) is when a person who is genetically male (who has one x and one y chromosome) is resistant to male hormones (called androgens). As a result, the person has some or all of the physical traits of a woman, but the genetic makeup of a man.