Some kids don't get enough vitamin D

A new study shows found 12 percent of infants and toddlers were deficient in vitamin D, and 40 percent had below-optimal levels.

Vitamin D is known as the "sunshine vitamin," and is produced by your skin in sunlight.

Experts say the low levels of vitamin D in teens may be attributed to their lifestyle, more time spent on the computer than outside in the sunlight, plus an increase use of sunblock.

This study was done at the Children's Hospital in Boston.