FGR affects roughly 5–10% of pregnancies. Not every small baby has a problem - many are small by build and perfectly healthy. So my first job is to tell the two apart. This matters, because studies show that growth restriction recognised before birth carries a much lower risk of stillbirth than growth restriction that is missed.
I perform and report the growth and Doppler scans myself at Divine Women's Hospital, Gota. I am accredited by the Fetal Medicine Foundation (UK) for the NT scan and trained in maternal-fetal medicine at Fernandez Hospital, Hyderabad. You can talk to me in Gujarati, Hindi or English, and your partner is welcome at the consultation.
Small Baby in Pregnancy: Healthy but Small, or Growth-Restricted?
On a scan I calculate the baby's estimated weight from measurements of the head, abdomen and thigh bone, and plot it on a growth chart. One measurement by itself tells me little. The pattern across several scans, together with the Doppler results, tells me much more.
- Small for gestational age (SGA): below the 10th centile, with normal Doppler and steady growth. Usually a healthy, small baby.
- Fetal growth restriction (FGR): below the 3rd centile; or below the 10th centile with abnormal Doppler; or a baby dropping across centile lines between scans.
There are two broad patterns:
- Early-onset FGR (before 32 weeks): less common, often linked to placental disease and pre-eclampsia, and usually more severe.
- Late-onset FGR (after 32 weeks): more common and often subtle. It is picked up most reliably by the middle cerebral artery (MCA) Doppler and by growth that is falling off.
Indian babies are, on average, smaller than babies on some Western charts. That is another reason I rely on the trend over serial scans more than on a single percentile.
Fetal Growth Restriction Causes: What Holds a Baby's Growth Back
- A placenta that is not working well, often together with high BP or pre-eclampsia.
- Tobacco in any form - smoking, gutkha, mishri or chewing tobacco - and alcohol.
- Anaemia, undernutrition or a very low weight before pregnancy.
- APLA, lupus, chronic kidney disease, or long-standing diabetes with changes in the blood vessels.
- Infections such as CMV, toxoplasma and malaria.
- Chromosomal or genetic conditions - especially when growth restriction is early and severe but the Doppler is normal.
- Twins, particularly when a shared placenta is divided unequally.
- A previous small baby or stillbirth, and pregnancy after IVF.
IUGR in Pregnancy Ultrasound: How a Small Baby Gets Picked Up
From about 24 weeks, the bump is measured with a tape from the pubic bone to the top of the womb (symphysis-fundal height). A bump that is small, or not growing, leads to a scan. Women with risk factors are offered growth scans routinely in the third trimester, because the tape measure on its own misses many small babies.
Accurate dates are essential, and these come from a scan in the first trimester. Different centres may use different reference charts, so I keep to one chart throughout your pregnancy and take your and your partner's height and weight into account.
Fetal Growth Restriction Stage 1 to 4: Reading the Doppler Results
Once a small baby is found, I check the anatomy again and repeat the growth measurements - no sooner than two weeks after the first scan.
| Scan finding | What it suggests | How often I check | When delivery is usually planned |
|---|---|---|---|
| All Doppler normal; estimated weight between the 3rd and 10th centile | Probably a healthy small baby | Growth every 2 weeks | Around 39 weeks |
| Estimated weight below the 3rd centile; Doppler normal | The baby is still coping | Closer review | Around 37 weeks |
| Low MCA Doppler or low cerebroplacental ratio | Brain-sparing (late FGR) | Doppler and CTG weekly | From about 37 weeks |
| Raised resistance in the umbilical artery | The placenta is under strain | Doppler once or twice a week | Usually by 37 weeks |
| Absent end-diastolic flow in the umbilical artery | Significant placental disease | Admission or very frequent checks | Around 32–34 weeks |
| Reversed flow, abnormal ductus venosus, or abnormal CTG | The baby is struggling | Steroids and urgent planning | Often from 30 weeks or earlier |
Some reports and second opinions describe growth restriction by stage rather than by these findings. Broadly, stage 1 covers a baby below the 3rd centile, brain-sparing or raised umbilical artery resistance. Stage 2 is absent end-diastolic flow, and stage 3 is reversed flow or an abnormal ductus venosus. Stage 4 adds signs that the baby's heart or the CTG is struggling. The higher the stage, the sooner delivery is usually considered. If your report quotes a stage, I check it against the measurements themselves, because one Doppler reading can vary with the baby's movements and breathing.
IUGR in Pregnancy Treatment: What Helps a Small Baby, and What Does Not
I want to be honest about this. Once the placenta is affected, no medicine makes the baby grow faster. Sildenafil, protein drinks and routine bed rest have not been shown to help, and I do not recommend them for this purpose. If you are admitted to hospital, it is for monitoring, not for rest.
What does help:
- stopping tobacco completely, in every form
- treating anaemia
- controlling BP
- a balanced diet with protein - dal, paneer, curd, eggs, sprouts and nuts
Above all, regular surveillance and delivery at the right moment are what help to avoid serious complications. In early, severe cases I may offer amniocentesis or tests for infection.
Fetal Growth Restriction Before 37 Weeks: Choosing the Time and Way of Birth
The key question at every visit is whether your baby is now safer outside the womb than inside it.
- If birth is expected before 34–35 weeks, you receive steroid injections to mature the baby's lungs.
- Before 32 weeks, magnesium sulphate is given to help protect the baby's brain.
- Many growth-restricted babies can be born vaginally after induction of labour, with continuous CTG monitoring.
- I advise a caesarean when there is absent or reversed flow, or when the CTG shows the baby is not coping with contractions.
Neonatal support is arranged in advance at Divine Women's Hospital.
Your IUGR Baby After Birth, and Planning the Next Pregnancy
After birth, the baby's blood sugar, temperature, jaundice and feeding are checked. Many babies born at term stay with their mothers; babies born early or very small may need neonatal care. Most babies catch up in growth over the first two years, with regular weighing and developmental checks. Babies who were growth-restricted do have a somewhat higher tendency to high BP and diabetes as adults.
For your next pregnancy, I plan:
- an early dating scan
- pre-eclampsia screening
- aspirin 150 mg from 12–16 weeks if the cause was placental
- serial growth scans from about 26–28 weeks
After the delivery I sit down with you to go through the placental findings and the test results. If you also had pre-eclampsia, your BP is followed up after the birth.
About the PCPNDT Act
Finding out the sex of a baby before birth is prohibited by law in India. I do not detect or disclose the baby's sex at any scan.
My Five-Step Approach to a Small Baby
- Checking the datesI confirm the due date against a first-trimester scan before calling a baby small.
- A detailed assessmentanatomy, amniotic fluid and Doppler, with infection or genetic tests where needed.
- Serial surveillancegrowth every two weeks; Doppler or CTG weekly or more often.
- A planned birthtimed to the baby's condition, with steroids, magnesium sulphate and neonatal support if the baby is early.
- A plan for next timea talk after the birth and a written plan for aspirin and early growth scans.
Reasons to See Me About Your Baby's Growth
- Your scan report says small, below the 10th centile, IUGR or FGR.
- Your bump is smaller than expected.
- A previous baby was very small or stillborn.
- You have high BP, APLA, lupus or kidney disease in pregnancy.
- You used tobacco in early pregnancy, or have severe anaemia.
- A Doppler report mentions raised resistance or brain-sparing.
Signs That Your Baby Needs Checking Today
- Movements that are reduced, have stopped or have changed - come in the same day.
- A severe headache, blurred vision or upper abdominal pain.
- Bleeding from the vagina or abdominal pain.
- Fluid leaking from the vagina.
When you are carrying a small baby, a change in movements should never wait until tomorrow. The labour and emergency team at Divine Women's Hospital works 24×7; call as you leave home and come in for a CTG, bringing your latest growth and Doppler reports.
Small-Baby Myths I Often Hear
Belief: More ghee and dry fruit will make the baby grow.
When the placenta is the cause, extra calories mostly add to the mother's weight. Stopping tobacco and treating anaemia have a real effect.
Belief: A small baby means an easier normal delivery.
Small babies have less reserve and need continuous monitoring in labour; some need a caesarean.
Belief: Bed rest will improve growth.
It has not been shown to help, and it raises the risk of clots. Monitoring and a well-timed delivery are what protect the baby.
Belief: If the baby measures small, my due date must be wrong.
Your dates are fixed by the first-trimester scan and should not be moved to fit a small measurement.
Questions Patients Often Ask Me About a Small Baby
What is the normal weight of a baby in the womb at each month?
As a rough guide, babies weigh about 300 g at 20 weeks, 1 kg at 28 weeks and 1.8 kg at 32 weeks. They weigh about 2.6 kg at 36 weeks and around 3 kg at 39–40 weeks. More important than any single number is the centile, and whether growth carries on at the next scans.
What is the difference between IUGR and FGR?
They mean the same thing. FGR (fetal growth restriction) is the current term; IUGR (intrauterine growth restriction) is the older one.
Can eating more increase my baby's weight?
A balanced diet and treatment of anaemia help, but extra food alone does not overcome a restriction caused by the placenta. Stopping tobacco does help.
Is a small baby always a problem?
No. Many babies below the 10th centile are healthy and simply small. Normal Doppler results and steady growth are reassuring.
What does absent or reversed flow in the umbilical artery mean?
It means the placenta is offering high resistance, so the baby receives less oxygen and nourishment. It calls for close monitoring and usually an early, planned delivery.
What does brain-sparing mean on a Doppler report?
When supply is limited, the baby redirects blood towards the brain. It is an important sign in late growth restriction.
Can growth restriction be prevented in my next pregnancy?
In women at higher risk whose problem was placental, low-dose aspirin started before 16 weeks may lower the chance. Treating APLA and high BP, and stopping tobacco, also help.
How should I count my baby's movements?
There is no fixed number to count. Learn your baby's usual pattern from about 24 weeks, and if movements slow down, stop or change, contact the hospital the same day rather than waiting until the next morning.
Will my baby need NICU if it is small?
Not always. Small babies born near term often stay with their mothers. Babies born early or with significant restriction are more likely to need neonatal care, and this is planned in advance.
Can so many scans and Dopplers harm my baby?
Diagnostic ultrasound and Doppler, used as indicated to monitor a pregnancy, have a long safety record. In a growth-restricted baby the information they give far outweighs any theoretical concern, and I keep each examination as brief as practical.