For your child's situation, I can recommend some types of frames to you. Such as Comfort-cable temples frames or Riding bow temples frames. As some persons say, comfort-cable temples hook behind the ear with a flexible metal cable and are good for children's glasses and for sport safety glasses. And I think this type will be suitable for your kid. Then Riding bow temples are just the similar type like comfort-cables, but they are rigid .Also, you should know that Modern eyeglass frames are available in a huge variety of styles, sizes, and materials. Children's and safety frames are now available in materials that are nearly indestructible. New materials and design technology have made frames more lightweight and comfortable. Maybe you should ask a professional person who can help you when selecting a quality frame that looks good and fits well. On the other hand, not only should you care much about the safety of the glasses, but also you can pay more attention to your kid's eyes and the health. It's very important for young.