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My toddler loves pouring water between these in the bath, and the fact that each cup holds exactly the right amount makes it easy to teach him about "more" and "less." The numbers on the bottom are a nice touch too, so he's starting to recognize them while he plays.

The numbers printed on the bottom are perfect for sneaking in a bit of counting practice during bath time, and the cups nest together so neatly they don’t take up half the toy basket. We use them for water play almost daily and they’ve held up to plenty of being chewed on, too.

The numbered bottoms are a nice touch for teaching order, and they nest together compactly for storage. My only gripe is the cups feel a bit thin, but they've held up fine to daily water play so far.