J.H.
My daughter had the same problem. First of all, I took her off of the rice cereal and gave her oatmeal. I mixed a small amount of the prune baby food in her oatmeal. My doctor also told me to give her veggies like peas which woud help her. If you have started fruit, peaches and pears will also help. As for the Karo syrup, my pediatrician advised us against it. He says that Karo syrup might have some sort of honey in it which has been linked to botulism.
Good luck!