A minimum infective dose is necessary to develop caries. Disease prevention should include preventive therapy for the parents. The substrate for s.mutans comes from juice, milk, formula, or any other liquid sweetened with fermentable carbohydrates. A favorite trick among parents in the UK used to be to thicken vitamin syrups with honey or other sugar syrup to ensure long feeding. The pacifier dipped in honey is another bad habit.
Honey needs to be avoided in the first year of life.
It has been associated with cases of infantile botulism. The botulism spores have also been detected in commercial corn syrups. One thing I recently saw in the U.S. are baby bottles with soda labels. Unfortunately I have also seen children with soda in their bottle. The bottle at nap time or bedtime is most dangerous.