Hard to judge how much a one-and-a-half year old should be able to pound something before it breaks. Grandson loved this set and walked around the house Christmas day pretending to drink coffee.\ from the cup. Then, as one-year-olds will, he started banging the cup on everything. The (also-guilty) grandfather in the room stop him. Cup cracked, bottom broke. Hmmm. Don't know how much abuse one of these sets should be expected to take. Users' fault or manufacturers? Can't say.
Bowls are great for baby/toddler. A bit warped in shape upon receiving but think they will reshape to normal with wash and wear. I think they will work great for separating frosting colors for decorating cookies for the holidays now too :)
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