The height of three-year-old babies has different standards for boys and girls. The height standard for three-year-old boys is about 97.5cm, and the height standard for three-year-old girls is about 96.3cm. The standard height for a three-year-old girl is about 96.3cm, and the normal height range is 92.5~100.1cm. The standard height for a three-year-old boy is about 97.5cm, and the normal height range is 93.7~101.4cm. Three-year-old baby exercise will increase, will be conducive to the body to grow taller, parents should pay attention to nutritional supplements, pay attention to protein supplementation, moderate amount of meat, eggs; pay attention to the amount of vegetables and fruits intake, not excessive intake of fruit. Cereal food for the main meal. Try to avoid fried food and stimulating food, so as not to affect the normal development of the baby and the digestive system.