Corn Syrup (Kayro) is 100% glucose. HFCS is glucose and fructose. Kayro has never added HFCS to its syrup.
https://www.karosyrup.com/fequently-asked-questions/
"General Info Should Karo® Syrups be used for infant feeding?
We are aware that some health care professionals suggest feeding Karo® Corn Syrups to infants in a formula or for relief of constipation. Because corn syrup, like many other foods, is not a sterile product, there is a remote possibility that it may contain C. botulinum spores.
These spores are common in the environment and generally not harmful to older children and adults. In fact, in the FDA study conducted in 1991, corn syrup and other syrups are not identified as food sources of C. botulinum spores for infants.
However, because Karo® Corn Syrups are not specifically intended for infant feeding, we suggest you consult your pediatrician for advice."