Your child's sun protective swimsuit should fit snugly. They stretch like a second skin for maximum comfort. Use this guide for both boys and girls. If your child is between sizes we suggest that you order the larger size. Measure height from crown to floor in bare feet. Size Height (inches) Height (cm) 0 30 75 (Toddler) 1 33 78 (Toddler) 2 36 92 (Toddler) 4 42 108 6 47 120 8 51 130 10 55 140 12 59 150