Learning to drink independently is an important step in a babys development. The NUK Evolution straw cup is a great solution for an active toddler. The cup has a soft and flexible silicone straw that is especially gentle on gums. Simply twist the lid and the straw disappears into the cup, helping prevent leaks and keeping the straw clean at home or on the go. The Evolution cup base can be used with all three lid types so you can easily transition between learner, 360 and straw as your baby grows.