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Developmental measures - Main article: Psychological aspects of
breast feeding With virtually no exceptions, human breast milk
is the best source of nourishment for human infants. However,
experts disagree about how long to breastfeed to gain the
greatest benefit, and how much more risk is involved in using
artificial formulas. A mother may breastfeed her infant, or
another infant, e.g., as a wet nurse. While there are
conflicting studies about the relative value of artificial
feeding, including infant formula, it is acknowledged to be
inferior to breastfeeding for both full term and premature
infants. In many countries, including the First World,