Differential diagnosis Chronically disease Family short stature Constitutional growth delay Intrauterine growth retardation Chromosomal abnormality 45, XO, 47XX2+21 Bone abnormality Emotional deprivationDifferential diagnosis • Chronically disease • Family short stature • Constitutional growth delay • Intrauterine growth retardation • Chromosomal abnormality ：45,XO， 47,XX,+21 • Bone abnormality • Emotional deprivation