This toy is not suitable for children under 5 year old.
这个玩具不适合五岁以下的小朋友。
Objective To analyze the cause of death in children under 5-year-old and study the measures of decreasing mortality of them.
目的分析5岁以下儿童死亡的主要原因，探讨降低5岁以下儿童死亡的措施。
The trend of infant and under 5-year old children mortality rate declined in 5 years;
②北京市婴儿和5岁以下儿童死亡率呈下降趋势；
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