Although the U.S. Supreme Court has decided that physician-assisted suicide is a matter of states' rights, there are many ethical and legal issues still unresolved for physicians.
When a pregnant woman is knowingly causing harm to her unborn child, there are various legal interventions that can be taken to protect the rights if the fetus.
Physicians are obligated in many jurisdictions to perform life-sustaining treatments on premature infants with serious developmental or physical impairments, even if it goes against the parents' wishes.