Du Plessis, Lisanne, H Kruger, and L Sweet. “II. Complementary Feeding: A Critical Window of Opportunity from Six Months Onwards”. South African Journal of Clinical Nutrition 26, no. S (September 21, 2013): S129-S140. Accessed February 18, 2020. http://www.sajcn.co.za/index.php/SAJCN/article/view/757.