Relating to the establishment of parentage and the duty to pay retroactive child support, including the duty to pay retroactive child support beginning on the date of the child's conception.

This bill amends Texas Family Code provisions to establish that courts must presume retroactive child support should begin on the date of a child's conception, not just from birth. It requires courts to determine the earliest conception date using medical evidence (per Health and Safety Code) or parental testimony, and mandates that obligors pay retroactive support from that date. The bill also adds provisions for courts to order obligors to cover an equitable share of prenatal/postnatal health care costs as part of retroactive support. It directly affects children, parents establishing paternity, and child support enforcement agencies by expanding the scope of retroactive payments. The changes apply to cases where paternity is established, including those involving pre-birth proceedings.