I've heard the Gold formulas can cause constipation, like Heinz nurture gold etc just get Heinz nurture. Hope that makes sense. I've heard karicare is gentle on tummies. We had the same prob when dd was having a top up once a day, I watered it down but she was getting most of everything she needed from me. I don't think watering it down would be a good idea because the quantities are important for nutritional needs. Not sure how old the bubba is as I'm on my phone but can you offer some boiled water in between feeds?