Intersex
An intersex individual's genitalia may be atypical in some way. It can be difficult to determine if an intersex baby is genetically male or female (with XY chromosomes or XX chromosomes). They may also have male and/or female secondary sex characteristics (such as body shape). However, there is a wide range of variation in sexual anatomy. There are many more subtle forms of sex anatomy, or sex chromosome differences. These don't even show physically. Some won't show up until later in life. Sometimes, the variation may appear when the baby reaches puberty or becomes an adult. It may not even be detected in an individual's lifetime, but as technology gets more advanced, that chance dims down.