Kan. Stat. Ann. § 59-2116
A consent or relinquishment may not be given by the mother or accepted until 12 hours after the birth of a child. Any consent or relinquishment given by the mother before 12 hours after the birth of a child is voidable, prior to the final decree of adoption.
L. 1990, ch. 145, § 6; L. 1994, ch. 301, § 12; July 1.