“…The optimal timing of weaning is still largely discussed in terms of the so-called "weanling's dilemma" (Lutter, 1992): the choice between the known protective effect of exclusive breastfeeding against infectious morbidity, and the insufficiency of breast milk alone to satisfy the infant's energy and micronutrient (e.g., iron) requirements beyond a certain age (McDade and Worthman, 1998;Foote and Marriott, 2003;Wilson et al, 2006;Fewtrell et al, 2007;Kramer and Kakuma, 2009). While modern recommendations suggest that the optimal length of time for exclusive breastfeeding to be at most 6 months (WHO, 2002;Fewtrell et al, 2007;Kramer and Kakuma, 2009), the benefits of continuation of partial breastfeeding during the first 2 years of life has also been demonstrated (Prentice, 1991;Lamberti et al, 2011).…”