Vitamin D plays an extremely important role in the absorption of calcium and phosphorus from the intestines. When the body lacks Vitamin D, it will mobilize calcium from the bones and make the bones soft and deformed, causing rickets in children and osteoporosis in adults. Sunbathing for babies is an effective way to stimulate the synthesis of vitamin D3 and help the development of the child's skeletal system.

Ringworm in children is quite common, often occurring in children from 3 to 6 months old, causing many parents to wonder if their child is lacking nutrients or has an illness.