The hypothalamus begins to release gonadotropin-releasing hormone (GnRH) to the pituitary gland, which makes hormones that control other glands in the body.The brain begins to send signals to the body to prepare for changes.At this stage, these internal changes are the same for males and females. It typically starts after a female’s 8th birthday and after a male’s 9th or 10th birthday. Tanner stage 1 describes what’s happening to your child before any physical signs of puberty appear. Here’s what you can expect to see based on the Tanner stages in males and females during puberty. They serve as a general guide to physical development, although each person has a different puberty timetable. Today, these stages are known as the Tanner stages or, more appropriately, sexual maturity ratings (SMRs). Tanner, a child development expert, was the first to identify the visible stages of puberty.
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