E.P.
Hi S.. We have a 5 yr old daughter who takes swim lessons at the Rose Bowl Aquatics Center. She is able to swim about 10 feet unassisted, float on her back, and retrieve an object under water. She's enrolled in Pre-school (ages 3-5) Level III. You can start your son in Level I or II. They have a good program there. They also offer private lessons. Good luck.