The standard height for a one year and three months old boy is 78.2~84.6cm and the standard weight for a one year and three months old girl is 77.2~83.2cm and the standard weight for a one year and three months old girl is 9.29~11.57kg. However, it is necessary to take into account individual differences. Height refers to the vertical distance from the top of the head to the bottom of the foot. It is significantly affected by genetics and endocrine secretions, and short-term nutritional fluctuations and diseases have less influence on height. The standard height for one year and three months old male babies is 78.2~84.6cm, while that for female babies is 77.2~83.2cm. Body weight is the combined weight of body tissues, organ systems, and body fluids. Since the weight of body fat and body fluids is easily affected by diseases, the weight is easy to fluctuate, so the weight is an important indicator to reflect the nutritional status of children. The standard weight of one year and three months old male babies is 9.81~12.27kg; the standard weight of female babies is 9.29~11.57kg. Due to individual differences, “standardized values” are not very appropriate for evaluating the growth and development of infants. Children’s growth and development indicators should be observed continuously over a long period of time, and individual differences should be taken into account when evaluating the growth and development indicators in order to make a correct judgment. If there is any obvious abnormality, it is recommended to consult a doctor in time.