What organised sporting activities (tennis, baseball, cricket) are there for 5 and 7 year olds? looking for something to enrol my boys, prefeably in the East or District 15.

How about joining a country club? Singapore swimming club in tanjong rhu is great for kids. They offer tennis, badminton, bowling, swimming, squash and table tennis facilities and classes. http://www.sswimclub.org.sg/facilities/facilities_sports.html