What to expect from antenatal steroid injection after waters break early

Premature rupture of membranes means the amniotic sac has opened before labour begins. When this happens early in pregnancy, antenatal corticosteroids may be offered because they help prepare a developing baby’s lungs if birth occurs early. The maternity team will confirm the fluid loss, assess your temperature and other signs of infection, monitor the baby and discuss whether antibiotics, observation or other treatment is needed. The injection is given into a muscle, usually with a schedule set by your obstetric team.

Tell the team about allergies, diabetes, medicines and any previous steroid reaction. Follow advice about hygiene, activity, intercourse and avoiding tampons while the membranes are ruptured. Notice your temperature, fluid colour and smell, contractions, pain and fetal movement, and report changes promptly. Keep the maternity unit’s urgent contact number available. You can read about [Antenatal Steroid Injection](/treatments/pregnancy-and-birth-care/antenatal-corticosteroid-injection/).

Contact the maternity unit immediately for fever or chills, feeling suddenly unwell, foul-smelling or green fluid, fresh bleeding, increasing abdominal pain, regular contractions, or reduced fetal movement. Sudden breathlessness, facial swelling or a severe reaction after an injection also needs emergency help. Do not wait for the next planned dose if a warning sign appears.

Ask how the injections will be timed, what side effects to expect, how blood sugar may be monitored if relevant, and how infection or labour would change the plan. Clarify when to return and what signs mean you should come straight to hospital.