Karo Syrup and my Constipated 2 Month old.?

I had to give my son at 2 months the same thing. My Pediatrician said the DARK kyro syrup. 2 teaspoons per 2oz 2 times a day until she is fine. It helped! There are a lot of people who say not to use it though... but my doctor said it so i dont think they would do anything to hurt my son!