What should you know about selective fetal growth restriction?

A difference in estimated size can reflect normal variation, but it can also signal that one placenta or part of the placental circulation is supporting growth less effectively. Clinicians compare measurements over time rather than relying on a single scan.

They may assess fluid around each fetus, blood flow in the umbilical cord and other vessels, movement, and each fetal heart pattern. The meaning depends on the type of multiple pregnancy, the stage of pregnancy, and whether either fetus shows signs of strain.

Keep every scheduled appointment because repeated measurements show whether growth and blood flow are stable or changing. A Growth Scan can measure the fetuses and compare fluid and placental findings, while Fetal Heart Monitoring helps assess wellbeing when the pregnancy is further along.

Your team may continue close observation, recommend hospital assessment, or discuss delivery when remaining pregnant becomes less safe than birth. Induction of Labour may be considered in suitable circumstances; the route and timing depend on both fetuses and your clinical findings.

Contact your maternity unit urgently for reduced or changed fetal movement, vaginal bleeding, leaking fluid, regular contractions, severe headache with visual symptoms, or sudden severe abdominal pain. Follow any personalised instructions about same-day assessment because changes in fetal wellbeing can require prompt monitoring.

Ask how the growth difference is measured, which blood-flow findings matter, how often scans or monitoring are needed, and what findings would change the recommended timing or method of birth.