Time To Clay does have high chairs to help you out with the little ones.
It depends on how well behaved they are? I wouldn't bring mine in, but he's pretty destructive. On one side of the room, all the pottery is right out on shelves that are in reach all the way to the floor. On the other side of the room, they have a wall full of colored glass for fuzing... Also not sure if there are high chairs. If you had a high chair you could strap the wee one in and be able to view them and talk to them from anywhere in the shop. So that could work.
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