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10% of children in UK. 
prevalence is higher in Asian, Afro-Caribbean and Chinese children

''Causes''
    socioeconomic - iron supplemented milk formulas may be more expensive
    unmodified cow's milk - poor source of iron (form that is not absorbed well) so give >1yr - breast milk - low in Fe but is in easily absorbable form
    ethnic origin - e.g. Asian mothers may introduce solids later

''Prevention''
    supplementary iron in milk
    dietary education
    free formulas for at risk infants