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Table 1 WHO definitions for infant feeding (WHO, 2008)

From: Questioning current definitions for breastfeeding research

Feeding category Infant receives May include Does not include
Exclusive breastfeeding Breast milk (including milk expressed or from a wet nurse) ORS, drops, syrups (vitamins, minerals, medicines) Anything else
Predominant breastfeeding Breast milk (including milk expressed or from a wet nurse) as the predominant source of nourishment Certain liquids (water and water-based drinks, fruit juice), ritual fluids and ORS, drops or syrups (vitamins, minerals, medicines) Anything else (in particular, non-human milk, food-based fluids)
Complementary feeding Breast milk (including milk expressed or from a wet nurse) and solid or semi-solid foods Anything else: any food or liquid including non-human milk and formula NA
Breastfeeding Breast milk (including milk expressed or from a wet nurse) and solid or semi-solid foods Anything else: any food or liquid including non-human milk and formula NA
Bottle-feeding Any liquid (including breast milk) or semi-solid food from a bottle with nipple/teat Anything else: any food or liquid including non-human milk and formula NA