Boston University School of Medicine, Division of General Pediatrics, Boston Medical Center, Boston, MA 02118, USA.
J Acad Nutr Diet. 2012 Mar;112(3):410-3. doi: 10.1016/j.jada.2011.10.024. Epub 2012 Mar 1.
Few if any studies have examined weight loss among term newborns by weighing infants daily for the first week of life. Perhaps because so few data exist, there is no standard in the United States for normal newborn weight loss. Our objective was to investigate normal newborn weight loss among infants born in a US Baby-Friendly hospital, by weighing infants daily for the first week of life. Using a prospective cohort design, infants born at an urban Boston, MA, hospital were enrolled within 72 hours of delivery and weighed daily for the first week of life. In hospital, infant weight was obtained from the medical record; post discharge, a research assistant visited the home daily and weighed the baby. All feeds in week 1 of life were recorded. Birth-related factors potentially affecting weight loss were abstracted from the medical record. Complete data were collected on 121 infants. Mean weight loss was 4.9% (range=0.0% to 9.9%); 19.8% (24 of 121) of infants lost >7% of their birth weight; no infant lost >10%. Maximum percent weight loss was significantly associated with feeding type: exclusively and mainly breastfed infants lost 5.5%, mainly formula-fed infants lost 2.7% and exclusively formula-fed infants lost 1.2% (P<0.001). Type of delivery and fluids received during labor were not associated with weight loss. Clinical practices at a Baby-Friendly hospital, which support and optimize breastfeeding, appear to be associated with only moderate weight loss in exclusively and mainly breastfed infants.
很少有研究通过在新生儿生命的第一周每天称重来检查足月新生儿的体重减轻情况。也许是因为数据太少，美国没有新生儿正常体重减轻的标准。我们的目的是通过在新生儿生命的第一周每天称重来调查在美国婴儿友好医院出生的婴儿的正常体重减轻情况。使用前瞻性队列设计，在马萨诸塞州波士顿的一家城市医院分娩的婴儿在分娩后 72 小时内入组，并在生命的第一周内每天称重。在医院，婴儿体重从病历中获得；出院后，研究助理每天都会到家中访问并给婴儿称重。记录了第一周的所有喂养情况。从病历中提取了可能影响体重减轻的与分娩相关的因素。共收集了 121 名婴儿的完整数据。平均体重减轻 4.9%（范围 0.0%至 9.9%）；19.8%（121 例中的 24 例）的婴儿体重减轻超过 7%；没有婴儿体重减轻超过 10%。最大体重减轻百分比与喂养类型显著相关：完全和主要母乳喂养的婴儿体重减轻 5.5%，主要配方奶喂养的婴儿体重减轻 2.7%，完全配方奶喂养的婴儿体重减轻 1.2%（P<0.001）。分娩类型和分娩时接受的液体与体重减轻无关。婴儿友好医院的临床实践支持和优化母乳喂养，似乎与完全和主要母乳喂养的婴儿体重仅适度减轻有关。
