在美国约有13%的存活产婴儿是早产，这意味着在婴儿是怀孕37周之前出生的，根据美国疾病控制和预防中心的一项调查显示。
About 13 percent of all live births in the United States are preterm, meaning the baby is born before the 37th week of pregnancy, according to the Centers for Disease Control and Prevention.
怀孕期间增加室内植物来改善室内居住质量。这样在你的孩子出生后会有一个更为愉快和健康的环境。
Improve the quality of your indoor air by adding lots of houseplants during pregnancy. Your home will be cheerier and healthier when your baby arrives.
然而，出生前后死亡率(怀孕22周和出生后第一周的婴儿死亡率)几乎相同。
But the perinatal mortality rate (the number of babies that die between the 22nd week of pregnancy and the first week after birth) was about the same.
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