As all parents know, a sippy cup is your best friend when it comes to your child taking a drink preventing spills and other mishaps such as slips and falls from spilt beverages. These handy toddler training cups are indeed for these purposes but parents are reminded of the fact that these cups are designed to allow a child to move from using a feeding bottle to a regular glass (plastic maybe) and that it is not intended for use for long periods of time. It should be filled most of the time with water only and filled with milk only during feeding time.