Our Speech Pathologists recommend the WOW Cup as the mechanism allows children to drink normally with gentle sucking without using spouts with valves which encourage a more forward tongue position.The spill free design virtually eliminates any messy clean-up. The 360 degree Uni-Flow drinking edge allows children to drink from anywhere along the rim. After drinking the rim automatically seals itself until the child takes another drink. This cup design helps children develop the oral and motor coordination to transition into a regular open round cup sooner without the headache and frustration of dealing with spills and endless training sessions! In addition, the no-spout and no-straw design helps in the prevention of potential Orthodontic issues due to long term sucking on spouts.