The height indicators for three-year-old babies are 91.1-98.7cm for boys and 90.2-98.1cm for girls. 90cm for babies is the low limit of the normal range and is normal. Because the growth and development of height is related to genetics, nutrition, exercise, disease, environmental many factors, some babies are late in development, the growth will be slower, so each child’s height is an individual difference, may be caused by the lack of trace elements in the body, eating paranoia, calcium deficiency can cause height development deficiency. The child is now in the golden stage of growth and development, do not worry, pay attention to the child’s nutritional balance, eat more food rich in iron, calcium and zinc, including milk, eggs, fish, meat, vegetables, fruits, etc.. In general, take your child to the outdoor sports, more sunshine, to ensure sufficient sleep time is helpful for the baby to grow taller.