It is normal for an 8-month-old child to be 70cm tall, and it is normal for a boy or girl to be 70cm tall. If the child is born with normal height and there is no serious family history of heredity, for example, both parents are short, and the child is fed normally in all aspects, the main thing to maintain normal height is to pay attention to reasonable feeding, not to be partial or picky, to pay attention to milk feeding and to pay attention to reasonable complementary food addition. At the same time, we must ensure that the child gets enough sleep every day, pay attention to the adjustment of the gastrointestinal function and spleen and stomach function of the child to avoid nausea, vomiting, diarrhea and other digestive system diseases, which can easily affect the absorption of nutrients in the child. Also pay attention to pediatric trace elements, such as calcium, iron, zinc and other elements, to give a reasonable supplement, or according to the results of the trace element test to adapt to the supplement, the daily appropriate sunlight, which is conducive to the synthesis of vitamin D skin, but also conducive to the absorption of calcium, which is conducive to the growth of children’s height.