The earliest major change that signals the onset of puberty is

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The adolescent growth spurt is the earliest major change that signals the onset of puberty. It marks the beginning of rapid physical growth and is characterized by a sudden increase in height and weight in both boys and girls. The growth spurt typically occurs between the ages of 8 and 13 years in girls and 10 and 15 years in boys. While the growth spurt is the earliest major change, it is often preceded by other signs of puberty such as the growth of pubic hair, breast development in girls, and testicular enlargement in boys.

The Earliest Major Change That Signals the Onset of Puberty