My 10yo has used the Ping for almost 4 years- using comfort short infusion sets (the angled manual ones!!) exclusively on her stomach. A few months ago her endo asked us to take a break from using her stomach because it was looking lumpy. The reason she was only using her stomach was because we could never get the same results on her tush. Stomach sites=always lasted a minimum of 4 days. We have switched to tush and the sites are going bad after only a day or two. I changed her site yesterday and already this evening I see her numbers crawling back up too high- I know I will need to change it out again in the morning. Because she uses the comfort shorts she is so down about having to change out so often, and of course I can't blame her! We have tried the inset 6mm and 9mm (I use the inset 9mm on my stomach with no issues at all- mine last 4 or 5 days) they DO NOT work for her. We've tried them on her stomach and her tush many times over the years. They stop working in a day or so every single time. I am using the top side of her tush and I of course alternate sides & exact location every time. She has some meat on her, slender but not skinny. She's solid & average weight for her age. What could I possibly be doing wrong? Should I go lower toward the cheek area? And why oh why won't the insets work for her? She would be the happiest child in the world if she could use the inset sites like I do. Thanks for any advice.