Nowadays, the formation of renal calculus among babies has become more and more serious. People have still not found out the reasons of causing renal calculus. It is said that the imbalanced nutrition is one of the reasons. The excessive intake of oxalic acid, protein and fat has been connected with the formation of calculus. The supplementation of and calcium also keeps a close relationship with calculus. The excessive intake of calcium and vitamin D can cause hypercalcemia and hypercalciuria. The calcium in the urination can be accumulated in the kidney to cause calculus. However, inadequate calcium and vitamin D can reduce the blood calcium and force the kidney to re-absorb the calcium in the urination to maintain the normal amount of blood calcium. Therefore, the amount of these two kinds of nutrients must be moderate inside the human body. At the same time, the discharge ability of phosphorus in the urination can be enhanced. The high amount of phosphorus in the urination is also an important reason of causing calculus. 

Vitamin D is fat-soluble, and it can be accumulated in the fat inside the human body. The long-term excessive intake of it can indeed cause poisoning and induce hypercalcemia and hypercalciuria. The calcification of the human organs like kidney can also be caused. According to the present information, the supplementation amount for babies younger than one year old should be less than 1000 international units, and the amount for babies older than one year old should be less than 2000 international units. Babies who always drink breast milk usually do not lack calcium, as they can absorb 300 to 500 milligrams of calcium. Parents should supplement calcium for babies in time if ablactation is conducted. The intake amount of calcium should not exceed 1000 milligrams for babies younger than one year old, and the intake amount should not exceed 2000 milligrams for babies older than one year old. The excessive intake of calcium can obviously cause hard stool and inappetence.

In short, the inadequate vitamin D and calcium can cause inadequate sediment of calcium in the bones. It is necessary for babies to supplement vitamin D and calcium under the guidance of the doctors. Generally speaking, the doctors will help babies supplement vitamin D and calcium meanwhile. At the same time, the excessive supplementation should be avoided, or various kinds of diseases can be caused to endanger the human health.