买回来的宝宝鳕鱼肠，没放多久就有一两个肠衣胀气的；新开一罐奶粉，发现铝膜轻微鼓胀。遇到这种情况，家长们是否有过疑惑？是产品变质了吗？宝宝还能吃吗？
家长们知道包装食品上通常会提示“胀袋勿食”，其原理是真空包装使袋内气压小于袋外气压，而食物变质后，繁殖的细菌会“蚕食分解”糖和蛋白质，从而产气“胀袋”。如果遇到这种“胀袋”食品，坚决不能给宝宝食用！
那有些家长纳闷，看产品保质期还很新鲜，为啥会胀袋呢？小宝宝的零辅食以安全为重，不会添加防腐剂，又多由乳制品类、米类加工而成，本身营养高，因而相对容易腐败；另外存储不得当，高温、暴晒，或未按要求低温储存等，都容易引起食物变质，加快“产气”速度，形成包装胀袋！
当然，现在宝宝零食的包装越来越升级，很多都有3层包装，从密封总盒装/袋装，再到中型分袋装，最后到独立真空小包装，保鲜又卫生，大大降低了胀袋风险！
零食胀袋是变质引起，让很多妈妈遇到奶粉罐铝膜鼓起时，也容易认为是奶粉变质了。我们首先需纠正这个误区：“铝膜轻微鼓起≠奶粉变质”，不太影响宝宝奶粉食用。
罐装奶粉一般采用“真空充氮”包装。啥意思？就是不但会抽出罐内的空气，还会充入惰性氮气，去置换残余的氧气。这样罐内就不仅是真空，而且是常压，同时奶粉的含水量很低（一般2%-5%），因此不太会出现奶粉变质而胀罐的现象，更不易瘪罐，还能保持奶粉松散性。
那奶粉罐铝膜为何“微鼓”？有3大物理因素：
① 氮气充得过多：奶粉罐密封的氮氧置换率通常能达到99.5%以上，但个别奶粉罐可能在设备开关机脉冲效应等的影响下，一时氮气充得过多，还没等内外气压平衡就封盖密闭。这种情况不用太过担心，因为氮氧置换量越高，奶粉质量相对能保存越好。
② 气压影响：海拔越低，气压越高；海拔越高，气压越低。所以像四川的妈妈买奶粉带到西藏去，罐内气压会高于罐外实际气压，而铝膜恰好是整个密封空间内相对最软的地方，高压气体便企图“趁虚而出”，就会发生鼓胀，国外有些奶粉罐带到中国也会发生这样的现象。当然现在奶粉罐的充氮技术已经很完善，会在最后有平衡气压的步骤，并通过恒压箱运输，所以气压影响铝膜鼓胀的情况也慢慢少见了。
③ 温度影响：高温也会影响气压，使之变低。这也是在夏天或者在暴晒处的奶粉容易发生铝膜鼓胀的原因。建议将奶粉罐移至阴凉处储存以恢复原样，放冰箱虽能很快验证，但不建议长期放置，以免奶粉受潮结块。
宝宝入口的食物，我们需要格外谨慎。那家长们如何避免买到包装胀袋、铝膜鼓起的零辅食或奶粉？门店又该怎样避免商品出现胀气等？ 家长3个注意：选择：最大前提是买宝宝奶粉及食品，上正规大型母婴店；购买：选购时不马虎，认真检查包装有无鼓胀、破损、漏气等，生产日期和保质期是否新鲜；存储：产品买回家后，注意在干燥、阴凉处存放，也可咨询门店有无“寄存”服务，产品随吃随取。
门店3个注意：陈列：避免在暴晒区、潮湿处陈列商品，尤其是真空袋装宝宝食品；理货：平时理货时，多关注货品有无胀气、漏气、铝膜鼓起等状况；出售：商品出售前，一定再仔细检核其完好性，是否在保质期内、外包装有无异常情况等。保证商品质量，才能给顾客满意的购买体验，以赢得长久信任。
对于宝宝零辅食包装胀气或奶粉罐铝膜鼓起，您现在清楚了吗？欢迎文末留言讨论~
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