This chapter provides detail description of normal and precocious puberty. Chapter has 21 well illustrated diagrams and pictures. Precocious puberty, approaches in the diagnosis of precocious puberty, normal puberty, hypothalamic-pituitary axis and central and peripheral causes of precocious puberty are described in detail with the help of excellent illustrations. 4 tables are included to highlight central causes of precocious puberty, peripheral causes of precocious puberty, benign variants of precocious puberty and approach in diagnosis of precocious puberty. Bibliography has 13 references at the end of the chapter for further reading.