I thought this was interesting in the FamilySearch wiki, although it probably doesn't apply in this case: https://familysearch.org/learn/wiki/en/Birth-baptism_intervals_for_family_historians Birth-baptism intervals for family historians, By Stuart Basten "... Finally, when a denomination opens a congregation in a new town, sometimes mass baptisms can occur. Again, these can often mean both children and adults either being baptized very late or even baptized twice. " - Dave