Iodine is an essential nutrient for growth and development during infancy. Data on iodine status of exclusively (EBF) and partially breastfed (PBF) infants as well as breast milk iodine concentration (BMIC) are scarce. We aimed to assess (a) infant iodine nutrition at the age of 5.5 months by measuring urinary iodine concentration (UIC) in EBF (n = 32) and PBF (n = 28) infants and (b) mothers' breast milk iodine concentration (n = 57). Sixty mother-infant pairs from three primary health care centres in Reykjavik and vicinities provided urine and breast milk samples for iodine analysis and information on mothers' habitual diet. The mother-infant pairs were participants of the IceAge2 study, which focuses on factors contributing to infant growth and development, including body composition and breast-milk energy content. The median (25th-75th percentiles) UIC was 152 (79-239) μg/L, with no significant difference between EBF and PBF infants. The estimated median iodine intake ranged from 52 to 86 μg/day, based on urinary data (assuming an average urine volume of 300-500 ml/day and UIC from the present study). The median (25th-75th percentiles) BMIC was 84 (48-114) μg/L. It is difficult to conclude whether iodine status is adequate in the present study, as no ranges for median UIC reflecting optimal iodine nutrition exist for infants. However, the results add important information to the relatively sparse literature on UIC, BMIC, and iodine intake of breastfed infants.

中文翻译：

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母乳喂养婴儿的碘状况及其母亲的母乳碘浓度。

碘是婴儿期生长发育必不可少的营养素。仅有（EBF）和部分母乳喂养（PBF）婴儿的碘状态以及母乳中的碘浓度（BMIC）的数据很少。我们旨在通过测量EBF（n = 32）和PBF（n = 28）婴儿和（b）母亲母乳中碘浓度（a）5.5个月时婴儿的碘营养水平来评估（i） n = 57）。来自雷克雅未克三个主要卫生保健中心的六十对母婴和附近地区提供了尿液和母乳样本，用于碘分析和有关母亲惯性饮食的信息。母婴对是IceAge2研究的参与者，该研究的重点是促进婴儿生长发育的因素，包括身体成分和母乳能量含量。UIC的中位数（第25-75个百分点）为152（79-239）μg/ L，EBF和PBF婴儿之间无显着差异。根据尿液数据（假设平均尿量为300-500 ml /天，根据本研究得出的UIC），估计的碘摄入量中位数为52至86μg/天。BMIC的中位数（25-75％）为84（48-114）μg/ L。目前尚难以得出碘状态是否足够的结论，因为尚无反映婴儿最佳碘营养的中位数UIC范围。但是，研究结果为有关UIC，BMIC和母乳喂养婴儿碘摄入量相对稀疏的文献提供了重要信息。根据尿液数据（假设本研究平均尿量为300-500 ml /天和UIC）。BMIC的中位数（25-75％）为84（48-114）μg/ L。目前尚难以得出碘状态是否足够的结论，因为尚无反映婴儿最佳碘营养的中位数UIC范围。但是，研究结果为有关UIC，BMIC和母乳喂养婴儿碘摄入量相对稀疏的文献提供了重要信息。根据尿液数据（假设本研究平均尿量为300-500 ml /天和UIC）。BMIC的中位数（25-75％）为84（48-114）μg/ L。目前尚难以得出碘状态是否足够的结论，因为尚无反映婴儿最佳碘营养的中位数UIC范围。但是，研究结果为相对稀疏的母乳喂养婴儿的UIC，BMIC和碘摄入量提供了重要信息。