Kathryn Dewey and Jane Heinig are eminent in their fields.  There are two
groups in the study, both exclusively breastfed for approx 22weeks. One
received a zinc supplement and the other did not. From the discussion:
"These results, and the lack of response to zinc supplementation in our
cohort, suggest that most breastfed infants in relatively affluent
populations absorb enough zinc to meet their needs for growth. This
contrasts with the generally positive effect of zinc supplementation of
breastfed infants in disadvantaged populations (25-28). It is likely that
infants in such populations are at greater risk of zinc deficiency not only
because of dietary factors but also because of lower birth weights and
higher morbidity associated with intrauterine malnutrition, poor sanitation,
and greater risk of infectious disease." 
This research appears to be an attempt (pretty successful, I'd say) to
silence those who contend that formula fed infants are bigger because they
are receiving higher concentrations of some key trace elements (in this case
zinc).  
There is a group of researchers (google Fomon) who are putting forward the
view that formula fed infants are bigger because human milk is actually
deficient in protein.  Scary really ...
Nina Berry BA/Bed(Hons) Dip Arts(Phil)
Breastfeeding Counsellor
PhD Candidate - "Ethical Issues in the marketing of 'Toddler Milks'"

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