The height of a 5-year-old boy is about 110cm and his weight is about 18kg, but there are individual differences. The height and weight of a 5-year-old boy are affected by many factors, such as parents’ genetics, nutritional status, diseases and so on. But usually, the height of a 5-year-old boy is about 110cm and his weight is about 18kg. Every child’s growth, has its own growth trajectory, occasional illness or malnutrition and other conditions, may lead to its temporary growth and development lag behind, as long as the follow-up correct catch up, still can achieve the ideal height and weight. However, if the height and weight of a 5-year-old boy is significantly different from that of babies of the same age, it is recommended that he seek timely medical attention to rule out disease factors, and actively treat and handle the situation if necessary.