Delay to excrete meconium, refractory constipation and abdominal distension are commonly seen, also commonly accompanying with enterocolitis in small intestine and colon, lower intestine obstruction.
临床表现为患儿胎粪排出延迟，顽固性便秘和腹胀，常并发小肠结肠炎、低位性肠梗阻，严重者危及患儿生命。
The ecology environment in the western region is very frailness, the load-bearing capacity of it is lower. After obstruction and destroying, it is difficult to resume in short time.
西部地区生态环境脆弱，承载能力低下，在遭受严重干扰和破坏后，很难在短时间内恢复。
MAS infants have been sensitized in utero, exacerhating lower respiratory tract obstruction when breathing, that become a hidden danger to the occurrence of asthma in children.
MAS患儿在宫内已致敏，其发生喘息时下呼吸道阻塞更严重，为儿童哮喘的发生埋下了隐患。
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