Infant baptism is not found specifically in scriptures, but baptism is. Infant baptism is a symbol of the parents dedicating themselves to raise the child up in a biblical way. (Just to insert a viewpoint, personally, I do not believe that it would be wrong for parents to have a priest/ pastor baptize their infant post mortem.) King David lost an infant son, but he was comforted in knowing that he would see him again in heaven. Infants, who die, regardless of how they died, are taken to heaven. Sin is what separates us from God. He offers every human being forgiveness and life with Him after our physical death, but we have to accept His offer. Infants cannot comprehend sin or anything else, except what they want. If they are hungry, they understand that. If something hurts that, they understand that that does not feel good. Since they cannot make decisions, or have knowledge of God, God does not judge them as He would someone who understands these concepts. We are all held accountable according to what we have come to know (what has been revealed to us about God). If baptizing their deceased infant/child helps grieving parents work through the grieving process, then by all means, it should be allowed.