Be assured that diaper will leak from the snap area only if the insert is full of moisture and the fleece area of the diaper cover gets full of moisture. This not a defect of the diaper. It is the mechanism how the diaper is made.

To avoid this you can change the baby more often, or you put a little more absorption. If you are using one small insert, you can add the second larger insert. You may also want to try a booster or a folded cloth wipe up front for boys or heavy wetters. 

Here is an informative video created by our CEO, Mohammed for this situation:

Rest assured, there is nothing wrong with the diaper, it is the nature of the diaper.