Inadequate exposure to sunlight causes a deficiency in cutaneously synthesized vitamin D. Diseases associated with vitamin D malabsorption include celiac sprue, short bowel syndrome, and cystic fibrosis. Breast milk has only minimal amounts of vitamin D. The American Academy of Pediatrics recommends vitamin D supplementation starting at age 2 months for infants fed exclusively with breast milk.
For more on the causes of vitamin D deficiency, read here.
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Cite this: Fast Five Quiz: Can You Identify and Prevent Vitamin D Insufficiency? - Medscape - Jun 04, 2014.