Kaur, A., G. Singh, and P. Malhotra. “Comparison of Serum Vitamin B12 Levels in Exclusively Breastfed and Mixed-Fed Term Infants Aged 3-6 Months: A Hospital-Based Observational Study”. International Journal of Contemporary Pediatrics, vol. 13, no. 7, June 2026, pp. 1100-4, doi:10.18203/2349-3291.ijcp20261897.