It took me a long time to find the right formula that would work for my boys. They were on a high calorie formula when they were born and because of that I was unable to breastfeed them. As soon as they gained enough weight, they were able to start 20 calorie formula. Carter, has to be on Sensitive formula. Every since he has been on that he has a problem having a dirty diaper. Sometimes it will be 5 days before he is able to poop. About 2-3 times a day, I give him 4 oz of sugar water (1/2 tsp of sugar). I heard that is supposed to help. Is there something else that I should be doing? He doesn't seem like he is any pain except when he tries to poop.