The 9-month-old baby can take oral calcium gluconate oral liquid or calcium carbonate granules. If the child has constipation, it is not suitable to take calcium carbonate granules orally, which may aggravate the symptoms of constipation. If a 9-month-old child has a calcium deficiency that causes night sweats, he or she can also take Longmu Zhuangbone granules orally, which is very effective. In daily life, you should pay attention to more oral calcium-containing foods, such as fish, shrimp, ribs or eggs, etc. are beneficial. In daily life also pay attention to more sunshine, more sunshine is conducive to skin synthesis of vitamin D, which is conducive to promote the absorption of calcium. If you are not able to ensure effective daily sunlight hours, you need to take oral vitamin D to assist the absorption of calcium, vitamin D should be sufficient, calcium can be reasonably absorbed.