Department of Child Health, Maternal and Child Health Hospital of Hubei Province, Wuhan, 430070, China.
Department of Maternal and Child Health, Tongji Medical College of Huazhong University of Science and Technology, Wuhan, 430030, China.
The growth rate for infants and young children manifests the significant differences between age, sex, regional, and seasonal distributions. The growth rate for infants and young children is a complex process that depends on interaction of the genetic and environmental factors. All genetic and environmental factors jointly contribute to the growth rate for infants and young children, for example heredity, birth weight, gestational ages, nutrition, diseases, assisted reproductive technology, parenting style, living condition, and economic situation. In this review, we report the epidemiological distributions and critical factors contributing to the growth rate for infants and young children.