Because babies come in a lot of shapes and sizes – hence, the standard small, medium and large don’t fit all body types. At BabyCozy, we measure a great many babies' legs, bottoms and waists to find out the best possible fit. Sometimes leaks happen because of folded waist or leg cuffs. Running a finger around the waist band and leg cuffs can help prevent ill fit. It's also not uncommon leakage is caused by weak asorption. If your baby is close to the upper end of the weight range of the diaper you're currently using, you might want to go for next size up as there is more absorbent material in larger diapers. For more about the causes and treatment of diaper leak click here.