The article discusses the top parenting classes available for children, with Goldfish Swim School in New York, New Jersey, and the Hamptons offering lessons for kids ages 4 months to 12 years. These classes, which range from $32 to $75 per group lesson with a $50 annual membership fee, have a distinctly 212 flair. Sharon Feiereisen, a mother of two, started the Mom Club when she realized that all her classes were for parents and children, were for kids and nannies. For kids ages 3 and older, Blue Balloon provides in-home private and small-group music lessons for children. Zing! at 1732 First Ave. offers open play and classes from 6 months up to 12-plus years.