There are risks to the mother with preterm birth as well, as other studies have found that women who give birth at less than 32 weeks double their lifetime risk of breast cancer.4.
早产也会给妈妈们带来很多危险，由另一些研究发现表明妇女如早于32周产婴会使她们患乳腺癌风险加倍。
3
Women exposed to indoor smoke thus have double the risk of lung cancer in comparison with those not exposed.