Velusamy, Prabu, and Kavitha Devarajulu. “Prevalence of Vitamin D Deficiency in Exclusively Breastfed Infants”. International Journal of Contemporary Pediatrics 6, no. 2 (February 23, 2019): 299–301. Accessed November 25, 2025. https://www.ijpediatrics.com/index.php/ijcp/article/view/2259.