### Comment:
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What safety measure is the child taking while skateboarding?

### REPLY:
The child is taking an essential safety measure while skateboarding by wearing a green helmet on their head. Helmets help protect the rider's head from potential injuries in case of falls or accidents, thus ensuring a safer and more enjoyable experience. It is always recommended for skateboarders, especially young and inexperienced ones, to wear helmets and other protective gear as part of responsible skateboarding practices.