As another reply said, being heavier than the average kid need not be a problem, e.g. When your kid also is taller than normal.
Your logic is broken (or you do not present all of it) in a different way: a quick google gives me the impression that for kids in the USA, the 75th percentile is about the edge case, but you need extra data to convert percentiles to 'being too heavy'. In the extreme, if everybody is overweight, even the lightest percent of kids will be overweight).
Your logic is broken (or you do not present all of it) in a different way: a quick google gives me the impression that for kids in the USA, the 75th percentile is about the edge case, but you need extra data to convert percentiles to 'being too heavy'. In the extreme, if everybody is overweight, even the lightest percent of kids will be overweight).