Sex assignment refers to the assigning (naming) of the biological sex at the birth of a baby. In the majority of births, a relative, midwife, or physician inspects the genitalia when the baby is delivered, sees ordinary male or female genitalia, and declares, "it's a girl" or "it's a boy" without the expectation of ambiguity. Assignment may also be done prior to birth through prenatal sex discernment. The assignment is perceived as a recognition of an essential aspect of a baby, apparent to everyone. In nearly all cases, usually without conscious deliberation, the parents rear the child as a member of the assigned sex/gender.