Plumbers crack 🤦🏻‍♀️

So my babe is in size 3 diapers, but whenever he sits his bum is always showing, and he always has blow outs! But size four diapers go above his belly button! So I’m just wondering if there are any diapers that run on the bigger size so maybe I can get some size three diapers that actually cover his whole bum 😂