Anyone can get stretch marks with rapid weight gain (such as in pregnancy), but cigarettes can be a contributing factor.

任何人都会在迅速增加体重时产生妊娠纹(比如怀孕)，但是香烟也是一个影响因素。

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Doctors now tend to focus on how much weight a woman should gain in a healthy pregnancy.

医生比较关注孕妇妊娠期体重增加量。

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Overall, 20 percent of the women in the study who gained more than 40 pounds — the upper limit of pregnancy weight gain recommendations in the United States — gave birth to heavy babies.

总体来看，在孕期体重增幅超过40磅的女性中，有20%的人生下了超重婴儿。在美国，孕期增重建议最高上限为40磅。

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Weight gain of 25 to 35 pounds is normal in pregnancy and not associated with an increase in risk for either premenopausal or postmenopausal breast cancer, the study found.

BBC: Breast cancer risk for large mums