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　　準(zhǔn)??(zhun)確??(que)來(lái)??(lai)說(shuō)??(shuo)?，免??(mian)疫??(yi)系??(xi)統(tǒng)??(tong)需??(xu)要?(yao)的??(de)是??(shi)“精??(jing)準(zhǔn)??(zhun)調(diào)??(tiao)控?(kong)”?，而??(er)非??(fei)“盲??(mang)目??(mu)增??(zeng)強(qiáng)??(qiang)”??。??過(guò)??(guo)度??(du)激??(ji)活??(huo)的??(de)免??(mian)疫??(yi)反??(fan)應(yīng)??(ying)如??(ru)同??(tong)失??(shi)控?(kong)的??(de)軍??(jun)隊(duì)??(dui)?，不??(bu)僅??(jin)無(wú)??(wu)法??(fa)保??(bao)護(hù)??(hu)健??(jian)康??(kang)?，反??(fan)而??(er)會(huì)??(hui)引??(yin)發(fā)??(fa)內(nèi)??(nei)亂??(luan)??。　　嬰??(ying)幼??(you)兒??(er)期?(qi)(0～3歲??(sui))?，新??(xin)生??(sheng)兒??(er)免??(mian)疫??(yi)系??(xi)統(tǒng)??(tong)像??(xiang)一??(yi)支??(zhi)未??(wei)經(jīng)??(jing)實(shí)??(shi)戰(zhàn)?(zhan)的??(de)“新??(xin)兵??(bing)部??(bu)隊(duì)??(dui)”?，先??(xian)天?(tian)性?(xing)免??(mian)疫??(yi)(如??(ru)中??(zhong)性??(xing)粒?(li)細(xì)??(xi)胞??(bao)、巨??(ju)噬??(shi)細(xì)??(xi)胞??(bao))活??(huo)性?(xing)高??(gao)?，但??(dan)皮??(pi)膚??(fu)、黏??(nian)膜?(mo)屏??(ping)障??(zhang)薄??(bo)弱??(ruo)?，易??(yi)受??(shou)病??(bing)毒??(du)(如??(ru)呼?(hu)吸??(xi)道?(dao)合??(he)胞??(bao)病??(bing)毒??(du)、輪??(lun)狀??(zhuang)病??(bing)毒??(du))侵??(qin)襲??(xi)??。??此??(ci)時(shí)??(shi)主??(zhu)要??(yao)依?(yi)賴??(lai)母??(mu)體??(ti)通??(tong)過(guò)??(guo)胎?(tai)盤??(pan)和??(he)母?(mu)乳??(ru)傳??(chuan)遞??(di)的??(de)抗??(kang)體??(ti)(如??(ru)IgG、IgA)提??(ti)供??(gong)保??(bao)護(hù)??(hu)??。。