Synopsis As Introduced Creates the Partial-Birth Abortion Ban Act of 2021. Provides that any person who knowingly performs a partial-birth abortion and thereby kills a human fetus or infant is guilty of a Class 4 felony. Provides that a person shall only perform or induce a partial-birth abortion on a viable fetus if: (i) the person is a physician; (ii) the person has a documented referral from another physician not legally or financially affiliated with the person performing or inducing the abortion; (iii) both physicians determine that the life of the mother is endangered by a physical disorder, physical illness, or physical injury, including a life-endangering condition caused by or arising from the pregnancy itself; and (iv) there is no other medical procedure that would suffice for that purpose. Provides that the maternal grandparents of the fetus or infant, if the mother has not attained the age of 18 years at the time of the abortion, may obtain appropriate relief unless the pregnancy resulted from the plaintiff's criminal conduct or the plaintiff consented to the abortion. Provides that a woman on whom a partial-birth abortion is performed may not be prosecuted under the Act, for a conspiracy to violate the Act, or for an offense under Article 31 of the Criminal Code of 2012, nor may she be held accountable under Article 5 of the Criminal Code of 2012. Effective immediately.