I want to buy a childrens table and chair(s) for Milo, and I am going to ikea tomorrow to have a look.

Basically i have two questions - timber or moulded plastic, and chair or stool?

The timber sets have a chair with a back on it, and the moulded sets, which look cuter, only have stools I think.

Is it bad for small children to sit on stools (i.e for their back)?