Parents are accountable to prepare their children for baptism at eight years of age.
25 And again, inasmuch as parents have children in Zion, or in any of her stakes which are organized, that teach them not to understand the doctrine of repentance, faith in Christ the Son of the living God, and of baptism and the gift of the Holy Ghost by the laying on of the hands, when eight years old, the sin be upon the heads of the parents.
President Thomas S. Monson said:
“There are those who dismiss these responsibilities, feeling they can be deferred until the child grows up. Not so, the evidence reveals. Prime time for teaching is fleeting. . . . Children learn through gentle direction and persuasive teaching. They search for models to imitate, knowledge to acquire, things to do, and teachers to please. Parents and grandparents fill the role of teacher. So do siblings of the growing child. In this regard, I offer four simple suggestions for your consideration: (1) Teach prayer, (2) Inspire faith, (3) Live truth, and (4) Honor God.”
(“Teach the Children,” Ensign, Nov. 1997, 17.)