In girls, pubeal development typically takes place over 4.5 years .Sex steroid production during pubey stimulates development of secondary sex characteristics,growth of long bones which is the reason for veical growth spu. * The first sign of pubey is accelerated growth, and breast budding is usually the first recognized pubeal change, followed by the appearance of pubic hair, peak growth velocity, and menarche. Delayed or interrupted pubey No Periods or any secondary sex characteristics by age 13, Have secondary sexual characteristics but not had menarche by age 15 or have not attained menarche 5 or more years since the onset of pubeal development. *Please note: the question can confuse us sometimes. If asked about the overall first event in pubey, then its Accelerated general growth. But if asked the first specific sign of pubey, then breast budding is the answer.