Referring to the Ministry of Health’s “China’s Growth and Development Reference Standards for Children Under 7 Years of Age”, the development of boys and girls is different. 3-year-old babies’ growth indicators are 10.61-20.64 kg and 86.3-109.4 cm for boys and 10.23-20.10 kg and 85.4-108.1 cm for girls. their height formula standard is age x 7 + 75( cm), while the weight formula standard is age × 2 + 8 (Kg). Children’s height and weight are related to various factors such as genetics, race, endocrine, nutrition, exercise and diseases, etc. Usually, you can make a comprehensive assessment of your child’s development based on the development of their height and weight. However, because each baby’s growth and development is different, the specific standards will vary. The above data is not an absolute standard. As long as the child’s height and weight values are within the normal range and the body has no abnormal medical conditions, parents need not worry too much. If there is an obvious abnormality in body size, it is necessary to seek medical attention in time. In addition, spring is the key season for children’s growth and development, so we should pay attention to making balanced nutritious meals for children to ensure a balanced intake of meat, eggs, milk, vegetables and fruits to promote their growth and development. It is also recommended to take children to more outdoor activities, more exercise and more sunshine to promote the absorption of calcium.