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高原地区对分娩前后的胎儿和婴儿均有影响。有资料报导在美国科罗拉多州海拔3,100m的某县从1949～1953年期间,新生儿死亡率为千分之四十二,大约是全州新生儿死亡率的二倍(全州平均海拔1,600m);科罗拉多州比接近海平面高度的伊利诺斯州和印第安纳州的新生儿死亡率高千分之六,新生儿的平均体重比伊利诺斯州和印笫安纳州的要少200g。这清楚表明海拔3,100m处甚至在1,600m处出生的新生儿不但体重减轻而且死亡率增加。作者最近对科罗拉多州1969～1973年新生儿和死婴进行了统计分析结果认为在海拔2,744～3,100m的高原地区,由于胎儿在子宫内生长发育迟缓,致使在出生时体重较轻。尽管过去的20年科罗拉多州的
Highland affects prenatal and postnatal fetuses and infants. Data from a county in Colorado at an altitude of 3,100 m reported that the neonatal mortality rate was 42 per 1,000 live births between 1949 and 1953, about twice as high as the state’s neonatal death rate (the state’s average elevation is 1,600 m ); Colorado’s neonatal mortality rates are six-thousandths higher than in Illinois and Indiana at sea level, and newborns weigh less than 200g on average in Illinois and Indiana. This clearly shows that newborns born at an altitude of 3,100 m and even at 1,600 m not only lose weight but also increase mortality. The authors recently conducted a statistical analysis of Colorado’s 1969-1973 newborns and dead babies and concluded that at a height of 2,744 to 3,100 meters above sea level in the plateau, the fetus is underweight due to the growth retardation in the uterus. Despite the past 20 years in Colorado