One commonly held belief is that coffee can cause low birth weight or miscarriage when consumed by pregnant women. 一般人相信怀孕妇女喝咖啡的话会导致新生儿体重过轻或流产。
Pregnant women who smoke deprive their babies of needed oxygen and other nutrients which may result in low birth weight. 怀孕妇女若抽烟的话会阻碍胎儿需要的氧气及其他养份,因此造成婴儿出生过轻。