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Causes of rickets include vitamin D deficiency, inherited disorders of vitamin D metabolism, dietary calcium deficiency and disorders of renal re-absorption of phosphorus.1 We have recently seen cases of rickets in exclusively breastfed infants <6 months old born to vitamin D deficient mothers. This observation led us to speculate that rickets in such infants might arise in part because of low breast milk concentrations of calcium and phosphorus. Therefore, the aim of this pilot study was to compare calcium and phosphorus concentrations in the breast milk of vitamin D deficient and replete mothers.
Competing interests: None declared.
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