There are a few developmental tips to consider when choosing between a sippy cup vs. a straw cup. A straw cup improves lip rounding, which is an essential movement for drinking and swallowing (and also for speech and language development). ezpz's straw has sensory bumps on the ‘training side’ of the straw to provide tactile input to help children understand (and feel) precisely where their lips need to be.   Straw cups improve tongue elevation and oral motor coordination. These movements help to improve your child’s swallowing skills and promote an appropriate resting position of the tongue.    The Mini Cup + Straw Training System keeps the lips toward the front of the straw to protect teeth alignment. Proper lip placement on a straw will decrease tongue suckling and avoid any pressure that could negatively impact teeth development. In summary, ezpz's straw cups can help improve your child’s development, whereas a sippy cup may delay development. Learn more on our blog here.