Arshiner offers a range of sizes to cater to different age groups and childrens body measurements. The available sizes for Arshiner dresses vary based on the specific design and collection. The size options range from toddler clothing sizes 2T, 3T, 4T, etc., to larger sizes for older children–4, 5, 6, 7, 8, and beyond. The size chart provided by the brand can help determine the appropriate size for your child based on their age and measurements.