The phrase "hyper child" refers to a child who is very energetic and has a lot of extra energy. They may have trouble sitting still or staying focused for long periods of time. Full definition
I bet they do not enjoy ten hyper children after a birthday treat. (thespruce.com)
Best of all, planned activities will keep even the most hyper children occupied and entertained, leaving stressed - out moms the time they need to decompress. (childdevelopmentinfo.com)