新生儿期为什么会出现体重下降?

2016-09-02 陈敏 副主任护师 湖南省儿童医院新生儿二科

如何评估新生儿体重下降程度?新生儿体重下降程度是反映摄入和排泄平衡的主要指标,是判断新生儿健康状况的重要依据之一。如果新生儿3天内若未见生理性体重下降甚至体重增加,应考虑排泄异常。剖宫产新生儿体重下降幅度明显大于平产新生儿,恢复至出生体重更晚。这种差异主要可能与剖宫产新生儿摄入不足有关,因有研究显示剖宫产术可能影响母亲催乳素的分泌,使泌乳延迟和减少;术后伤口疼痛可能影响哺乳,使早期吸吮频度及乳汁分

如何评估新生儿体重下降程度?

新生儿体重下降程度是反映摄入和排泄平衡的主要指标,是判断新生儿健康状况的重要依据之一。如果新生儿3天内若未见生理性体重下降甚至体重增加,应考虑排泄异常。剖宫产新生儿体重下降幅度明显大于平产新生儿,恢复至出生体重更晚


这种差异主要可能与剖宫产新生儿摄入不足有关,因有研究显示剖宫产术可能影响母亲催乳素的分泌,使泌乳延迟和减少;术后伤口疼痛可能影响哺乳,使早期吸吮频度及乳汁分泌减少。第一胎新生儿及夏季分娩的新生儿体重下降的幅度偏大。



新生儿体重下降恢复时间

至生后2周(12~14天),早产、足月及过期产AGA(出生体重适于胎龄儿),其体重平均比出生体重分别增加102g、208g及173g,大约每天分别增长7.3g、14.9g及12.4g。至生后4周(26~28天)时,其体重分别比出生体重增加710g、854g及839g。据此数据推算,整个新生儿期(28天),大约平均每天分别增加25.4g、30.5g及30g。


新生儿体重从第2周起增长迅速,至生后4周,早产、足月及过期产AGA儿体重的定基增长速度分别为29.2%、26.7%及25.2%,以早产儿增长的速度最快,它们生长到第2月时,体重增长的速度分别可达84.6%,68.3%及63.3%,仍以早产儿最快。这表明,早产儿体重的正常追赶生长,从生后4周已明显显示出来。巨大儿体重(新生儿的出生体重等于或大于4000g称为巨大儿)月增长平均值低于低出生体重儿(新生儿出生体重低于2500g称为低体重儿)和正常出生体重儿,这与不同出生体重儿出生后第一年的生长各自遵循自己的生长轨迹有关。


新生儿期婴儿体重增长速度与出生体重、胎龄及喂养方式有关。新生儿体重丢失虽然在新生儿出生后2、3、4天纯母乳喂养与人工喂养有显著差异,但纯母乳喂养体重丢失在10%生理性体重丢失范围内,且体重回升早,恢复快,能满足新生儿生理需要。因此应大力提倡母乳喂养。母乳喂养对婴儿健康无论是近期还是远期都有深远影响,近期影响能促进婴儿的体格发育和健康,因为母乳是婴儿的必需和理想的食品,其所含营养物质量最适合婴儿的生长发育需要。母乳喂养儿在出生后第一月体重的增值超过人工喂养,充分证明了婴儿4~6个月内纯母乳喂养的必要性和科学性;而母乳喂养对婴儿的长期健康效应在于可降低成年期心血管疾病、非依赖性糖尿病、过敏性疾病发生的危险性。


如何避免新生儿体重下降过多

对正常分娩、母亲情况良好者,提倡在产后半小时开始哺乳,因吸吮反射是人类的本能,此反射于胎内32~36周时成熟,出生10~30分钟最强,30分钟后减弱,直到第二天才恢复 。早接触、早开奶、早吸吮可锻炼、巩固吸吮反射,有助于母乳分泌及喂养成功,以避免新生儿生理性体重下降过多。哺乳前不宜给新生儿喂糖水,因为新生儿在出生前,体内已贮存了足够的营养和水分,可以维持到母亲来奶,而且只要尽早给新生儿哺乳,少量的初乳能够满足刚出生的正常新生儿的需要。

如遇到新生儿反复呕吐而进食少,应及时干预:新生儿呕吐大多数因分娩时吞咽羊水而刺激胃部所致,其临床特点为新生儿出生后24小时左右反复多次呕吐。使新生儿取头高脚斜坡15°~20°角右侧卧位,及时实施母乳喂养、1小时喂哺10%葡萄糖10~20ml、2小时喂哺10%葡萄糖15~20ml,10%葡萄糖可起到冲淡、稀释、清洗胃内粘稠液的作用,同时通过新生儿反复呕吐又达到洗胃的目的。如无呕吐继续母乳喂养或给予人工代乳喂哺。据报道胃排空是在进食水后5分钟开始,而葡萄糖可在新生儿胃中停留10分钟以上,并且能被直接吸收利用,同时交替喂哺人工代乳,及时提供新生儿生长发育所需的蛋白质、葡萄糖等营养物质,能明显降低新生儿体重下降程度。

如果体重下降太多或10天以上不能恢复到出生体重,就应查找原因,分析是否由于母乳不足、喂养不合理或患病等因素所致,以便及早采取措施。

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    2016-09-05 李东泽

    很好,不错,以后会多学习

    0

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    2016-09-05 李东泽

    很好,不错,以后会多学习

    0

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    2016-09-04 ylzr123

    赞!拜读,值得深入学习!

    0

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    2016-09-03 有备才能无患

    生理性体重下降

    0

  5. [GetPortalCommentsPageByObjectIdResponse(id=111509, encodeId=2181111509c7, content=很好,不错,以后会多学习, beContent=null, objectType=article, channel=null, level=null, likeNumber=76, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/jW482SpianMayicTRbRZ5RzUn81b5CF5ibVPib8jWI92iciaxmqGHlwruOnK4SVZykd4iahqo1hicklIibyZoxm55X7EM8BW9eX1h1hQ2/0, createdBy=8aa81937526, createdName=李东泽, createdTime=Mon Sep 05 15:18:00 CST 2016, time=2016-09-05, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=111392, encodeId=f2e3111392d8, content=很好,不错,以后会多学习, beContent=null, objectType=article, channel=null, level=null, likeNumber=81, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/jW482SpianMayicTRbRZ5RzUn81b5CF5ibVPib8jWI92iciaxmqGHlwruOnK4SVZykd4iahqo1hicklIibyZoxm55X7EM8BW9eX1h1hQ2/0, createdBy=8aa81937526, createdName=李东泽, createdTime=Mon Sep 05 10:46:00 CST 2016, time=2016-09-05, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=110959, encodeId=a25111095934, content=赞!拜读,值得深入学习!, beContent=null, objectType=article, channel=null, level=null, likeNumber=74, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/NUyjXTCJjo7s7ZCKOmmbBTD6nE7gcd5OZpvyGEzkxBP3S275k5ZJVrsPkotZhBglRHM9rKvcj1OgkssqhcnoPw8zIaMZTF8c/0, createdBy=4c441942088, createdName=ylzr123, createdTime=Sun Sep 04 20:55:00 CST 2016, time=2016-09-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=110458, encodeId=978411045885, content=生理性体重下降, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/NUyjXTCJjo7cJ6ejWUr2nIia8qOvAKNdLHr32Df6G8iaoaOx6pHaoiacwp26DaslxZHCGbibZhhCGven4rvmWP60GahtzgFjgCjR/0, createdBy=6b111703011, createdName=有备才能无患, createdTime=Sat Sep 03 20:41:00 CST 2016, time=2016-09-03, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=110392, encodeId=98451103928c, content=学习了谢谢。, beContent=null, objectType=article, channel=null, level=null, likeNumber=77, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://cdnapi.center.medsci.cn/medsci/head/2017/04/21/72142930668371951a41ef4ea4b233e6.jpg, createdBy=dcbc1715228, createdName=刘煜, createdTime=Sat Sep 03 14:51:00 CST 2016, time=2016-09-03, status=1, ipAttribution=)]
    2016-09-03 刘煜

    学习了谢谢。

    0

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