The rules for baptism in the Church of Jesus Christ of Latter Day Saints include being eight years of age or older, interviewing with a church leader or missionary, and agreeing to the Mormon Doctrine and Covenants 20:37. The Doctrine and Covenants 20:37 specifies being humble before God, desiring baptism, repenting of sin, and determining to serve Christ, among other qualifications.
Baptism in Mormonism is seen as a remission of personal sins, not a general sinful nature, as the church does not believe in the idea of original sin. Because of that belief, baptism cannot be completed until after the age of accountability, when a person is no longer innocent. The church therefore rejects infant baptism.
Baptism can only be performed by someone ordained by God in the priesthood. Children in Mormon families are often baptized by their fathers or other close male relatives. Membership in the Mormon church is only granted through baptism by the church, so it does not recognize the baptisms of other faiths.
Converts to the Mormon faith go through the baptismal interview, in which the interviewer determines if they meet the guidelines set forth by the Doctrines and Covenants. Baptismal interview questions are posted at LDS.org and address subject matter such as homosexual relationships and criminal activity.