Thermos Travel Tumbler, $15
Kids can sip from any point along the rim of this mug (essentially one big, adjustable spout), thanks to a series of holes that open when the lid is twisted. The flow can be controlled, letting out a little or a lot, depending on kids' capabilities. Hand wash.

Size: 14-ounce capacity; 2 1/2-inch base diameter.

To Buy: www.target.com for store locations.