Crimes: abortion; abortion; prohibit. Amends 1931 PA 328 (MCL 750.1 - 750.568) by adding secs. 89a & 322a & repeals sec. 322 of 1931 PA 328 (MCL 750.322).

HB 4671 amends Michigan's penal code to establish criminal liability for injury or death of an unborn child under assault and homicide laws, defining "unborn child" as a living human being from fertilization. The bill adds exceptions allowing medical procedures that unintentionally harm or kill a fetus when performed to save the mother's life, preserve the fetus's health, or during a spontaneous miscarriage. It applies existing legal defenses (like duress) and presumptions to cases involving fetal injury or death, treating the unborn child as equivalent to a born individual for prosecution purposes. This bill directly affects medical providers and individuals whose actions may cause fetal harm during medical treatment, as it clarifies when such actions could be prosecuted under criminal law.