Understanding Fetal Growth Restriction and Its Implications for Birth Planning

By Birth & Baby University · Last updated: October 2026 · 4 min read

A diagnosis of fetal growth restriction (FGR) usually means more scans, more monitoring and a birth plan that depends on test results. Families are often frightened and unsure what the term means. Doulas do not interpret ultrasound findings, but understanding how FGR is defined and managed lets you support the conversation and the decisions around it.

Key takeaways

• FGR is not the same as a small baby. An international expert consensus defines it using specific measurements, and separates early (before 32 weeks) from late (32 weeks or later) forms.
• At term, the DIGITAT trial found no important difference in adverse neonatal outcomes between induction and expectant monitoring with intensive surveillance.
• For very preterm FGR, the TRUFFLE trial found the monitoring strategy did not significantly change the primary outcome, though a later-delivery trigger was associated with more survivors free of neurological impairment.
• Decreased fetal movement is a marker for risk. Families should contact their care team promptly when they notice a change.

What the research says

What FGR means

A 2016 Delphi consensus of 45 experts defined early FGR (under 32 weeks) as an abdominal circumference or estimated fetal weight below the 3rd centile, or absent end-diastolic flow in the umbilical artery, or combinations such as measurements below the 10th centile with abnormal Doppler pulsatility. For late FGR (32 weeks or later), an abdominal circumference or estimated weight below the 3rd centile is sufficient, with contributory criteria including below the 10th centile, crossing centiles and an abnormal cerebroplacental ratio. The consensus shows that FGR is a clinical diagnosis based on scan findings, not simply birth weight, and that different guidelines still vary. ACOG Practice Bulletin 227 addresses FGR in the United States, and this article read only its publication record.

Near term: induction or monitoring?

The DIGITAT trial randomized 650 women in the Netherlands with suspected growth restriction beyond 36 weeks to induction or expectant monitoring. Babies in the induction group were born about 10 days earlier and weighed 130 g less. The composite adverse neonatal outcome was 5.3 percent with induction and 6.1 percent with monitoring (difference -0.8 percent, 95% CI -4.3 to 3.2), and cesarean rates were similar (14.0 and 13.7 percent). The authors concluded there were no important differences, that people who prefer non-intervention can safely choose expectant management with intensive monitoring, and that it is also rational to choose induction. This was a trial of suspected FGR, so findings may not apply to every severity.

Very preterm FGR

The TRUFFLE trial randomized 503 women at 26 to 32 weeks to three monitoring strategies for deciding when to deliver. Survival without neuroimpairment did not differ significantly across groups at the primary endpoint (77, 84 and 85 percent; p for trend 0.09). Among survivors, more infants were free of neuroimpairment when delivery was triggered by late ductus venosus changes (95 percent versus 85 percent with cardiotocography; p = 0.005), but with a non-significant increase in perinatal and infant mortality. It was unblinded and the authors state the question of timing remains complex.

Fetal movement

A Australian cohort of 101,597 women found that 8.7 percent presented at least once with decreased fetal movements. Presenting was not associated with higher odds of stillbirth in that setting (aOR 0.54, 95% CI 0.23 to 1.26), but was associated with small-for-gestational-age babies (aOR 1.14) and more planned early-term birth, induction and emergency cesarean. The authors describe decreased movement as a marker of increased risk, and note that the low stillbirth rate may reflect a clear management algorithm and community awareness.

What this means for doulas

• Explain what FGR is not. It is not defined by the parent’s size or diet, and there is no evidence reviewed here that a family caused it.
• Do not interpret scans or Doppler. Help families ask what the measurements mean for their plan and when the next check is.
• Expect plans to change. Induction, planned cesarean or earlier birth may be offered depending on gestation and findings. Help families weigh the clinician’s reasoning with their values.
• Encourage prompt reporting of reduced movement. Contact the care team without waiting for the next appointment.

Putting the evidence into practice

• Offer a question list: what is the diagnosis based on, how often will we monitor, what would trigger delivery and what happens in the NICU if the baby is born early.
• Prepare for a possible NICU stay, including how to bond and express milk, depending on gestation and the unit’s practices.
• Be present for the emotional load of waiting between scans.
• Avoid false reassurance or blame, and refer questions about risk to the care team.

The bottom line

FGR management depends on gestational age and test results, and trials show real uncertainty about the best timing of birth. Doulas help by clarifying language, supporting good questions and staying alongside families through extra monitoring and changing plans.

This article is for professional education. It is not medical, legal or tax advice. Check the standards of your certifying organization and the rules where you work.

Sources and further reading

• Gordijn SJ, et al. Consensus definition of fetal growth restriction: a Delphi procedure. Ultrasound in Obstetrics and Gynecology 2016. Read the source
• Boers KE, et al. Induction versus expectant monitoring for intrauterine growth restriction at term: randomised equivalence trial (DIGITAT). BMJ 2010. Read the source
• Lees CC, et al. 2 year neurodevelopmental and intermediate perinatal outcomes in infants with very preterm fetal growth restriction (TRUFFLE): a randomised trial. Lancet 2015. Read the source
• Turner JM, et al. Evaluation of Pregnancy Outcomes Among Women With Decreased Fetal Movements. JAMA Network Open 2021. Read the source
• American College of Obstetricians and Gynecologists. Fetal Growth Restriction: ACOG Practice Bulletin No. 227. Obstetrics & Gynecology 2021. Read the source

Helping families through changed plans and extra monitoring is part of doula support. See the training and mentorship options on the For Doulas page.

More for professionals: the Professionals Blog.