1. (2022, July 15). Vitamin D Is Needed to Support Healthy Bone Development, Available online: https://www.cdc.gov/breastfeeding/breastfeeding-special-circumstances/diet-and-micronutrients/vitamin-d.html.
2. Vitamin D deficiency: A worldwide problem with health consequences;Holick;Am. J. Clin. Nutr.,2008
3. Kramer, M.S., and Kakuma, R. (2002). Cochrane Database of Systematic Reviews, John Wiley & Sons, Ltd.
4. Vitamin D deficiency in breastfed infants & the need for routine vitamin D supplementation;Balasubramanian;Indian J. Med. Res.,2011
5. Vitamin D deficiency in infants aged 1 to 6 months;Choi;Korean J. Pediatr.,2013