The World Health Organization (WHO) began to recommend
that babies be exclusively breastfed in 1990 [1],
and since 2001 has stated that the optimal duration is
six months (180 days) [2]. However, researchers often
find it difficult to obtain data on exclusive breastfeeding,
forcing some to report only on rates of “predominant”
(only non-milk fluids given in addition to breast milk)
and “partial” (breastfeeding combined with other milks
and/or solid foods)