Baby's drinking style changes rapidly as he grows and develops his oral skills.It is important to provide him with a comfortable and smooth transition from breastfeeding to eventually drinking with a straw independently. MagMag Training Cup System is designed to facilitate and enhance the development of baby's drinking skills by allowing a smooth transition from nipple to straw with its interchangeable drinking tops. Mag Mag All-in-One Set is a training cup that comes complete with all the 3 interchangeable tops for ease of training. Step 3 - Straw Top Once your baby's sucking power gets stronger, train him to drink using straw, just like an adult. Leak-proof when the lid is completely close. Hole at straw tip is cross-cut, hence Spill-proof. SofT silicone straw for easy drinking. Lower straw part is bent at an angle for easy drinking till the last. Wide and straight handles for easy holding.