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A disruption in the body's calcium and phosphorus metabolism leads to rickets, a condition that primarily affects young infants. A baby's first few years of life go by swiftly. Vitamin D controls how calcium and phosphorus are absorbed from the intestines and transported to bones and other tissues for healthy bone formation. Vitamin D deficiency causes rickets. The majority of vitamin D is produced in the skin under the effect of sunshine, and it is only found in trace amounts in diet.