It can wiggle, it can wobble, but it won't fall down. The amazing Stephen Joseph Sippy Cups, are not just gorgeously designed, they're innovative too. Toddlers have a habit of spilling things on themselves, on mom, on the person across the street. but not the contents of this cup. It's got a cleverly weighted rounded base, so no matter how hard they try to soak you, it's going nowhere. The clever design doesn't stop there - each one comes apart into three pieces that can be popped in the dishwasher.