This guideline covers the care of women at increased risk of, or with symptoms and signs of, preterm labour (before 37 weeks), and women having a planned preterm birth. It aims to reduce the risks of preterm birth for the baby and describes treatments to prevent or delay early labour and birth. In this guideline we use the terms 'woman' or 'mother' throughout. These should be taken to include people who do not identify as women but are pregnant or have given birth. In June 2022, we made new recommendations on the use of repeat courses of maternal corticosteroids. For further details see update information.