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Premature thelarche tests recognizing when breast development starts before the usual age without the rest of puberty appearing. When a girl develops breasts early but there are no other pubertal changes—no rapid growth, no pubic hair, no menarche—this pattern is typically a benign and self-limited situation. It’s not driven by early activation of the hypothalamic-pituitary-gonadal axis, which is what true central precocious puberty involves. Central precocious puberty would show additional signs of puberty and typically an accelerated growth spurt with bone age advancement. Delayed puberty means puberty starts later than normal, and normal puberty means the sequence and timing are typical. So early breast development in isolation fits the benign form of precocious puberty.