What to Do When a 8-Year-Old Starts Breast Development?

A 10-year-old child has started breast development, showing small hills in the breasts without any previous checks. They feel their breast development is earlier and larger than their peers, with a height of 150 cm and a weight of 87 pounds. We want to know if this is a case of precocious puberty and whether it will affect future height. What kind of exams should be done?
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