I would disagree on two counts. First, Ps. 51:5 & 58:3 call children sinners, and that very word indicates that a sinner is held responsible for his or her sin. That includes the guilt of sin and the susceptability of its penalty which is eternal death. I believe children are saved, but however they are saved it must have been through the redemption in Christ for there is no other course for salvation. Second, Paul also wrote, "To be absent from the body is to be present with the Lord" (2 Cor. 5:8). If the Lord is in heaven, then all Christians who have left their bodies are present with Him also.