In those at risk, the hormone progesterone, if taken during pregnancy, may prevent preterm birth.[5] Evidence does not support the usefulness of bed rest.[5][10] It is estimated that at least 75% of preterm infants would survive with appropriate treatment, and the survival rate is highest among the infants born the latest.[3] In women who might deliver between 24 and 37 weeks, corticosteroids improve outcomes.[6][11] A number of medications, including nifedipine, may delay delivery so that a mother can be moved to where more medical care is available and the corticosteroids have a greater chance to work.[12] Once the baby is born, care includes keeping the baby warm through skin to skin contact, supporting breastfeeding, treating infections and supporting breathing.[2]