Actually the Bible does allude to the fact the righteous have "guardian angels", in fact the two passages of Scripture below would seem to support children "inheriting salvation"Many things are possible in silence, but I would be careful in forming doctrine because of or in the mist of silence. It is like people that teach that we all have guardian angles. First the bible never even hints to such. Second if we do they are doing a terrible job. So just because something seems good and proper by man's standards, one would be well advised to not hold to a belief that God has not clearly confirmed.
Hebrews 1:14 Are they not all ministering spirits sent out to serve for the sake of those who are to inherit salvation?
Matthew 18:10 "See that you do not despise one of these little ones. For I tell you that in heaven their angels always see the face of my Father who is in heaven.