As our son outgrew his SPF baby swimsuit, we purchased a Stingray Kids Stinger Suit. The suit has full length arms and legs for full body protection from the sun and blocks 97.5% of UV rays. Stingray is the original sun protection clothing company in Australia and has the highest rating for blocking UV rays. I purchased a suit from stingray.com in a size 4 when our son was just 2 and since he is tall, it just required one roll of the pants and sleeves for a great fit! We actually were originally sent a larger size from Stingray which is based in Australia and with one call to customer service, we were sent the correct size and were told to keep our larger size one for the future. They were extremely helpful and pleasant to deal with so we will be continuing to purchase from Stingray!