Jitterbugs has been going for about 6 years in Shanghai and is so popular that many of their locations have waiting lists. They offer kid's classes with a mix of musical fun, dance, activities and PE to help develop your child's creativity and physicality. Classes provide an informal, vibrant environment for your child and the parent to enjoy. They run nice and simple sessions all over Pudong and Puxi. Costs are around 100rmb per session, or save by buying a bulk of classes. They are 45 minute sessions where kids of different ages, from 1 to 5, can dance around and meet other little kids too. Click here for more information about their different classes.