has part has part characteristic of inheres in has modifier development of secondary sexual characteristics Precocious puberty The onset of secondary sexual characteristics before a normal age. Although it is difficult to define normal age ranges because of the marked variation with which puberty begins in normal children, precocious puberty can be defined as the onset of puberty before the age of 8 years in girls or 9 years in boys. SNOMEDCT_US:400179000 UMLS:C0034013 Early onset of puberty Early puberty HP:0000826 SNOMEDCT_US:123527003 Early onset of sexual maturation abnormal premature