1. Al-Marzook, D., Al-Ameri, D., Al-Hayayi, E., et al. (2016). Knowledge, attitude & practice of vitamin D supplementation status among six months old infants in Abu Dhabi Island. International Journal of Medical and Pharmacological Sciences, 6, 1–9.
2. Alfaleh, K. M., Al-Manie, A. M., Al-Mahmoud, H. F., Al-Razqan, H. M., Al-Mutlaq, A. B., Al-Rumaih, S. A., Hasanato, R. M., & Al-Mandeel, H. M. (2014). Prevalence of vitamin D deficiency in saudi newborns at a tertiary care center. Saudi Medical Journal, 35(2), 178–182.
3. Centers for Disease Control and Prevention (2021). Breastfeeding and special circumstances. CDC. https://www.cdc.gov/breastfeeding/breastfeeding-special-circumstances/diet-and-micronutrients/vitamin-d.html
4. Clark, M. (2016). Parenting matters: supporting parents of children Ages 0–8. National Academies of Sciences, Engineering, and Medicine (41 vol.). Issue 2). The National Academies Press. https://doi.org/10.17226/21868.
5. Crocker, B., Green, T. J., Barr, S. I., Beckingham, B., Bhagat, R., Dabrowska, B., Douthwaite, R., Evanson, C., Friesen, R., Hydamaka, K., Li, W., Simmons, K., & Tse, L. (2011). Very high vitamin D supplementation rates among infants aged 2 months in Vancouver and Richmond, British Columbia, Canada. Bmc Public Health, 11. https://doi.org/10.1186/1471-2458-11-905.