Narayan, Raghvendra, Shivani Singh, and Om Prakash Singh. “A Study of Pattern of Vitamin D Deficiency in Newborns With Reference to Its Gestational Age and Birth Weight”. International Journal of Contemporary Pediatrics 7, no. 3 (February 25, 2020): 582–587. Accessed November 6, 2025. https://www.ijpediatrics.com/index.php/ijcp/article/view/3068.