The present invention relates to methods and kits for reducing the occurrence of preterm delivery and other pregnancy-related conditions in pregnant female subjects exhibiting one or more risk factors for preterm delivery and other pregnancy-related conditions. For example, the present invention relates to methods for reducing the occurrence of preterm delivery in a pregnant female subject having no history of preterm delivery and exhibiting one or more risk factors for preterm delivery (e.g., smoking during pregnancy). The methods and kits provide for the administration of a steroid hormone to the pregnant female subject.
