They'll make a real splash in this kid's swimwear. From boldly printed to plain practical styles, shop beach-ready designs that feature elasticated waists, zipped pockets and mesh lining here. Browse brands including Dsquared2, Neil Barrett and OVS, and find something he'll love to take on holiday. If he's serious about diving and doing lengths, invest in some Speedo swimwear. Is he more of a pool games kind of guy? Then opt for playful fashion-led trunks from MC2 Saint Barth instead.