Relating to the required inclusion of a person's sex on a birth certificate and prohibited change of sex on the birth certificate of certain minors.

HB 477 requires Texas birth certificates to list a child's biological sex (male or female) based on sex organs, chromosomes, or medical determination at birth. It prohibits changing this information on minors' birth certificates except in three specific cases: correcting clerical errors, completing missing biological sex data, or updating after a later medical determination for children born with atypical sex characteristics. The bill directly affects parents, medical providers reporting births, and local registrars who issue birth certificates. It does not apply to adults or allow changes to gender identity on birth records.