Abstract Carbon ( 13 C/ 12 C) and nitrogen ( 15 N/ 14 N) stable isotope ratios were longitudinally measured in fingernail and hair samples from mother‐infant pairs where infants were exclusively breastfed (n = 5), breast‐ and formula‐fed (n = 2), or exclusively formula‐fed (n = 1) from birth. All ex...
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