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　　這??(zhe)一??(yi)階??(jie)段??(duan)的??(de)維??(wei)護?(hu)重??(zhong)點??(dian)包??(bao)括??(kuo)：母??(mu)乳?(ru)喂??(wei)養(yǎng)??(yang)??，至??(zhi)少??(shao)純??(chun)母??(mu)乳??(ru)喂??(wei)養(yǎng)?(yang)6個??(ge)月??(yue)??，提??(ti)供?(gong)抗?(kang)體??(ti)和??(he)益??(yi)生??(sheng)菌??(jun)??，降??(jiang)低??(di)感??(gan)染??(ran)風??(feng)險??(xian)；按??(an)時??(shi)接??(jie)種??(zhong)百??(bai)白??(bai)破??(po)、脊??(ji)髓??(sui)灰??(hui)質??(zhi)炎秘(yan)等??(deng)基??(ji)礎??(chu)疫?(yi)苗??(miao)??，建??(jian)立??(li)免??(mian)疫??(yi)記??(ji)憶??(yi)；適??(shi)度??(du)“練??(lian)兵??(bing)”??，避??(bi)免??(mian)過??(guo)度??(du)消?(xiao)毒??(du)??，適??(shi)當??(dang)接??(jie)觸??(chu)環(huán)??(huan)境?(jing)微??(wei)生??(sheng)物?(wu)(如?(ru)戶??(hu)外??(wai)活??(huo)動??(dong))??，促??(cu)進??(jin)免??(mian)疫??(yi)系??(xi)統(tǒng)??(tong)發(fā)??(fa)育??(yu)??。??　　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??(jing)實?(shi)戰(zhàn)??(zhan)的??(de)“新?(xin)兵??(bing)部??(bu)隊??(dui)”??，先??(xian)天??(tian)性??(xing)免??(mian)疫?(yi)(如??(ru)中??(zhong)性??(xing)粒??(li)細??(xi)胞??(bao)、巨??(ju)噬??(shi)細??(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?(shi)主??(zhu)要??(yao)依??(yi)賴??(lai)母??(mu)體??(ti)通??(tong)過??(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??(hu)??。。