First, make sure your child’s nose is pressing firmly into the mask to create a proper seal. Check the underside of the lid to ensure the mask’s circular tab sits flat; if any edges are curled, gently pull the mask down so it lies flat. Next, ensure your child is swallowing the liquid while keeping the mask sealed against their nose. If this does not work, try the under-nose mask and repeat these steps. If your child still cannot complete a successful treatment, follow the IFU instructions for a suspected air leak, and contact help@earflocare.com for further assistance if needed.