This referrence does not provide instruction as to the method of entering a record of baptism as discussed in the previous posts.smithgw wrote:Mentally handicapped members are sometimes categorized as "Not Accountable." The definition of this classification and the possiblility of eventually being baptized are covered on page 33 of the Church Handbook of Instructions, Book 1. This may be of help to you.
The CHI, page 32, does define a convert baptism as baptisms of persons age nine and older who have never been baptized and confirmed. There is another definition but does not apply to this situation. With that in mind the baptism records should be handled by the mission.