“We believe that also through the Sacrament of Baptism the Holy Spirit applies the gospel to sinners, giving them new life (Titus 3:5) and cleansing them from all sin (Acts 2:38). The Lord points to the blessing of Baptism when he promises, “Whoever believes and is baptized will be saved” (Mark 16:16). We believe that the blessing of Baptism is meant for all people (Matthew 28:19), including infants. Infants are born sinful (John 3:6) and therefore need to be born again, that is, to be brought to faith, through Baptism (John 3:5).
“We reject the view that babies should not be baptized and that they cannot believe in Christ (Luke 18:15-17). We reject the view that baptism must be by immersion.”
Those statements are from This We Believe: A Statement of Belief of the Wisconsin Evangelical Lutheran Synod. This link will take you to those statements in context.