Size Chart(Product Measurement):

Bikini Tops:
8 Years: Bust: 24-29.5", Top Length: 6.9", Underbust: 21.3"

9 Years: Bust: 25.2-30.7", Top Length: 7.2", Underbust: 22.4"

10 Years: Bust: 26.4-31.9", Top Length: 7.5", Underbust: 23.6"

11 Years: Bust: 27.6-33.1", Top Length: 7.8", Underbust: 24.8"

12 Years: Bust: 28.7-34.3", Top Length: 8.1", Underbust: 26"

Bikini Bottoms:
8 Years: Bottoms Length: 8.9", Hip Size: 24.0", Waist Size: 20.5-29.5"

9 Years: Bottoms Length: 9.3", Hip Size: 25.2", Waist Size: 21.7-30.7"

10 Years: Bottoms Length: 9.7", Hip Size: 26.4", Waist Size: 22.8-31.9"

11 Years: Bottoms Length: 10.1", Hip Size: 27.6", Waist Size: 24-33.1"

12 Years: Bottoms Length: 10.5", Hip Size: 28.7", Waist Size: 25.2-34.3"