CNN: 'There Is No Consensus Criteria For Assigning Sex At Birth'

Though the two executive orders signed by [South Dakota's Republican Gov. Kristi Noem] do not explicitly mention transgender athletes, they reference the supposed harms of the participation of "males" in women's athletics -- an echo of the transphobic claim, cited in other similar legislative initiatives, that transgender women are not women. The orders also reference "biological sex," a disputed term that refers to the sex as listed on students' original birth certificates.

It's not possible to know a person's gender identity at birth, and there is no consensus criteria for assigning sex at birth.