A baby growth scan during pregnancy is an ultrasound that checks your baby’s growth, size, weight, and overall wellbeing.
Pregnancy is often described as a journey of growth.
Every week, your baby develops new skills, gains weight, and moves closer to life outside the womb.
While many parents eagerly follow these milestones through pregnancy apps and weekly updates, healthcare providers focus on something equally important:
fetal growth monitoring.
Quick Answer
Growth monitoring during pregnancy involves regularly assessing how your baby is growing inside the womb using methods such as fundal height measurements, ultrasound scans, and fetal surveillance techniques. Monitoring helps healthcare providers identify babies who may be growing too slowly or too quickly, assess placental function, and ensure that both mother and baby receive appropriate care throughout pregnancy.
Growth monitoring during pregnancy is more than simply measuring the size of your baby.
It helps doctors and midwives understand whether your baby is growing as expected,
identify potential complications early, and make decisions that improve outcomes for both mother and baby.
As a women’s health physiotherapist,
I frequently meet expectant mothers who become anxious when they hear phrases such as “your baby is measuring small” or “we need to monitor growth more closely.”
In many cases, additional monitoring is simply a precaution.
However, understanding how fetal growth is assessed can make these conversations far less stressful.
Key Takeaways
- Growth monitoring helps ensure that your baby is developing appropriately throughout pregnancy.
- Fundal height measurements and ultrasound scans are commonly used to track fetal growth.
- Babies who measure significantly smaller or larger than expected may require additional monitoring.
- Fetal growth restriction can increase pregnancy risks and often requires closer surveillance.
- Doppler ultrasound studies help assess blood flow between the placenta and the baby in high-risk pregnancies.
- Many women who require additional growth scans go on to have healthy pregnancies and healthy babies.
- Attending regular antenatal appointments remains one of the most important ways to support maternal and fetal health.
Why Is Growth Monitoring During Pregnancy Important?
Every baby grows at their own pace.
However, babies who grow significantly slower or faster than expected may have a higher risk of complications during pregnancy, labour, and after birth.
Regular growth monitoring helps healthcare providers:
- Track fetal growth over time.
- Detect fetal growth restriction early.
- Identify babies who may be unusually large.
- Assess placental function.
- Reduce the risk of stillbirth and pregnancy complications.
- Decide whether additional surveillance or early delivery is needed.
One of the major goals of growth monitoring is identifying fetal growth restriction (FGR), a condition in which the fetus does not reach its genetically determined growth potential. (Chew et al. 2024)
How Is Baby’s Growth Monitored During Pregnancy?
Many parents assume that ultrasound is the only way to assess fetal growth.
In reality, doctors use several methods.
Fundal Height Measurement
After approximately 24 weeks of pregnancy, your healthcare provider may measure the distance from your pubic bone to the top of your uterus.
This is known as the symphysis-fundal height measurement.
In uncomplicated pregnancies, fundal height often roughly corresponds to the number of weeks of pregnancy.
For example, a woman who is 30 weeks pregnant may have a fundal height measurement close to 30 centimetres.
While this method is simple and inexpensive, it is mainly used as a screening tool rather than a diagnostic test. (Whelan et al. 2022)
Ultrasound Assessment
Ultrasound plays a central role in fetal growth monitoring.
During an ultrasound examination, the sonographer measures several fetal body parts, including:
- Head circumference
- Abdominal circumference
- Femur length
- Biparietal diameter
These measurements help estimate fetal weight and growth trajectory.
Serial ultrasound examinations are often more informative than a single scan because they allow healthcare providers to observe growth patterns over time. (Salomon et al. 2019)
What Happens If the Baby Is Measuring Small?
One of the most common reasons for additional monitoring is suspicion that the baby is measuring smaller than expected.
A baby may measure small for several reasons.
Sometimes, the baby is simply constitutionally small because of parental genetics.
However, in some cases, reduced growth may indicate fetal growth restriction (FGR). (Bamfo et al. 2011)
FGR is associated with increased risks, including:
- Stillbirth
- Preterm birth
- Low birth weight
- Neonatal complications
- Long-term health problems
When FGR is suspected, doctors may recommend:
- Additional ultrasound scans.
- Doppler studies to assess blood flow.
- More frequent antenatal visits.
- Non-stress testing.
- Biophysical profile assessments.
Can Babies Grow Too Quickly?
Yes.
While many parents worry about babies being too small, excessive fetal growth can also create challenges.
A larger-than-average baby is sometimes referred to as large for gestational age (LGA) or macrosomia.
Possible causes include:
- Gestational diabetes.
- Maternal obesity.
- Excessive pregnancy weight gain.
- Previous large baby.
- Genetic factors.
Excessive fetal growth may increase the likelihood of:
- Difficult labour.
- Shoulder dystocia.
- Caesarean delivery.
- Birth injuries.
Growth monitoring helps healthcare providers prepare for delivery and minimise complications.
What Are Doppler Ultrasound Studies?
Many women become anxious when their doctor recommends a Doppler scan.
A Doppler ultrasound is simply a specialised ultrasound that evaluates blood flow.
In pregnancies affected by fetal growth restriction, Doppler studies provide valuable information about:
- Umbilical artery blood flow.
- Placental circulation.
- Fetal adaptation to reduced oxygen supply.
Research shows that adding Doppler ultrasound to standard surveillance improves outcomes in high-risk pregnancies. (Messawa et al. 2012)
Which Pregnancies Need Closer Growth Monitoring?
Not every pregnancy requires repeated baby growth scan during pregnancy.
However, additional surveillance is often recommended when certain risk factors are present.
Examples include:
- High blood pressure.
- Preeclampsia.
- Gestational diabetes.
- Twin pregnancy.
- Previous fetal growth restriction.
- Smoking during pregnancy.
- Maternal kidney disease.
- Autoimmune disorders.
- Obesity.
- Previous stillbirth.
Women with these conditions often undergo serial ultrasound examinations throughout the third trimester.
A Physiotherapist’s Perspective: Managing Anxiety About Growth Scans
Waiting for baby growth scan results during your pregnancy can be emotionally draining.
Many women tell me that the days leading up to a scan are more stressful than the appointment itself.
A few strategies may help:
- Limit excessive internet searches.
- Continue approved physical activity.
- Practise diaphragmatic breathing.
- Attend antenatal physiotherapy sessions.
- Share concerns openly with your healthcare team.
Physical activity during uncomplicated pregnancies has been associated with improved maternal well-being and reduced anxiety.
How Often Are Growth Scans Performed?
A common question parents ask is, “How many growth scans will I need?”
The answer depends entirely on the individual pregnancy.
Women with uncomplicated pregnancies may not require any additional growth scans beyond routine ultrasound examinations.
However, if risk factors are present, healthcare providers may recommend serial baby growth scan during pregnancy every two to four weeks.
For example:
| Pregnancy Situation | Typical Growth Monitoring |
|---|---|
| Suspected fetal growth restriction | Every 2 to 4 weeks |
| Twin pregnancy | Every 2 to 4 weeks |
| Hypertension or preeclampsia | Individualised monitoring |
| Gestational diabetes | Depending on fetal growth pattern |
| Previous growth-restricted baby | Increased surveillance |
More frequent scans are not always better.
Very short intervals between scans may make it difficult to accurately assess growth changes because fetal measurements naturally vary.
What Is Fetal Growth Restriction?
Fetal Growth Restriction (FGR) occurs when a fetus fails to achieve its expected growth potential.
It is important to understand that not every small baby has FGR.
Some babies are naturally small because of genetics.
FGR specifically refers to babies whose growth has slowed because of underlying factors such as placental insufficiency.
Common causes include:
- Placental dysfunction
- Maternal hypertension
- Smoking during pregnancy
- Maternal malnutrition
- Certain infections
- Chromosomal abnormalities
Early identification of FGR is extremely important because it allows healthcare providers to optimise pregnancy management and determine the safest timing for delivery.
Can Maternal Lifestyle Influence Fetal Growth?
Yes.
Although many factors affecting fetal growth cannot be controlled, some lifestyle choices can influence pregnancy outcomes.
Healthy habits that support pregnancy include:
- Eating a balanced and nutrient-rich diet.
- Attending regular antenatal appointments.
- Avoiding smoking and alcohol.
- Staying physically active when medically permitted.
- Managing chronic health conditions appropriately.
- Following medical advice regarding weight gain.
Smoking deserves special mention.
Research consistently demonstrates that maternal smoking significantly increases the risk of fetal growth restriction and low birth weight. (Delcroix et al. 2023)
The Role of Maternal Exercise During Pregnancy
Many women worry that exercise could harm their baby or restrict fetal growth.
Current evidence suggests the opposite for most uncomplicated pregnancies.
Regular moderate-intensity exercise during pregnancy has been associated with improved maternal cardiovascular health,
reduced risk of gestational diabetes, improved psychological well-being, and healthier pregnancy outcomes.
As a physiotherapist, I often encourage expectant mothers to remain active unless their obstetrician advises otherwise.
Suitable activities may include:
- Walking
- Prenatal yoga
- Stationary cycling
- Aquatic exercise
- Antenatal physiotherapy programmes
Physical activity should always be individualised according to the woman’s medical condition and pregnancy status.
What Happens If Growth Concerns Are Identified?
Discovering that your baby may not be growing as expected can feel overwhelming.
However, identifying growth concerns early gives healthcare providers an opportunity to intervene.
Management may include:
- Additional growth scans.
- Doppler ultrasound assessments.
- Fetal heart rate monitoring.
- More frequent antenatal visits.
- Maternal blood pressure monitoring.
- Referral to a maternal-fetal medicine specialist.
In some situations, healthcare providers may recommend early delivery if they believe remaining inside the womb poses greater risks than birth.
The decision is always individualised and based on multiple factors.
Can Growth Monitoring Prevent Complications?
Growth monitoring cannot prevent every complication.
However, it plays a vital role in identifying pregnancies that require closer observation.
Timely detection of abnormal growth patterns allows healthcare teams to:
- Improve fetal surveillance.
- Plan appropriate delivery timing.
- Reduce complications associated with placental dysfunction.
- Optimise neonatal outcomes.
Research has shown that structured fetal growth surveillance programs may improve detection of growth restriction and potentially reduce stillbirth risk. (Danciu et al. 2025)
Can You Track Your Baby’s Growth at Home?
Parents naturally want reassurance between appointments.
However, fetal growth cannot be accurately measured at home.
Some useful ways to stay connected with your pregnancy include:
- Attending all antenatal appointments.
- Monitoring fetal movement patterns in the third trimester.
- Reporting any concerns promptly.
- Following your healthcare provider’s recommendations.
Avoid comparing your pregnancy with friends, relatives, or information found on social media.
Every pregnancy is unique.
Myths vs Facts About Growth Monitoring During Pregnancy
Myth: A baby measuring small always means something is wrong.
Fact: Some babies are naturally small because of genetics. Healthcare providers use additional assessments to determine whether a baby is constitutionally small or affected by fetal growth restriction.
Myth: More ultrasound scans are harmful to the baby.
Fact: Diagnostic ultrasound performed by trained healthcare professionals for medical reasons is considered safe during pregnancy when used appropriately.
Myth: Exercise during pregnancy can slow the baby’s growth.
Fact: Moderate physical activity is generally safe in uncomplicated pregnancies and may improve maternal health and pregnancy outcomes.
Myth: A baby measuring large always means the mother has gestational diabetes.
Fact: Many factors influence fetal size, including genetics, maternal body composition, previous pregnancies, and normal biological variation.
Myth: If one growth scan is normal, no further monitoring is needed.
Fact: Fetal growth patterns can change throughout pregnancy. Some women may require serial growth scans depending on their medical history and pregnancy risk factors.
Myth: You can accurately track your baby’s growth at home by measuring your belly.
Fact: Although maternal abdominal growth provides useful information, fetal growth can only be accurately assessed by healthcare professionals using clinical examinations and ultrasound measurements.
Questions You May Want to Ask Your Doctor
Consider discussing the following questions during your appointment:
- Is my baby’s growth currently within the normal range?
- Will I need additional baby growth scan during my pregnancy?
- What do these measurements mean?
- Are there any concerns about placental function?
- Should I modify my physical activity?
- What symptoms should prompt urgent medical review?
- Will growth concerns affect my delivery plan?
Writing down questions beforehand often helps parents feel more prepared and reassured.
Conclusion
Growth monitoring is an essential part of modern maternity care.
Although additional scans and surveillance can sometimes create anxiety,
they often provide valuable information about your baby’s well-being.
As a women’s health physiotherapist,
I encourage expectant mothers to remember that growth monitoring is not about finding problems.
Instead, it is about ensuring that both mother and baby receive the right care at the right time.
Attend your appointments, remain physically active if medically permitted, ask questions, and seek support whenever needed.
Every baby grows differently, and every pregnancy deserves individualised care.
Final Thoughts
Growth monitoring plays an essential role in ensuring the health and well-being of both mother and baby during pregnancy. Although additional scans and surveillance can sometimes feel overwhelming, they often provide valuable reassurance and allow healthcare providers to identify concerns early. Attend your appointments, stay informed, and remember that every pregnancy follows its own unique path.
Final Thoughts
Pregnancy can sometimes feel like a series of measurements, numbers, and scan reports.
Yet behind every measurement is a growing baby and a family eagerly awaiting their arrival.
Growth monitoring allows healthcare providers to better understand how your baby is developing and helps create the safest possible environment for birth.
In many cases, extra monitoring simply offers reassurance and peace of mind.
Trust your healthcare team, listen to your body, and remember that you do not have to navigate pregnancy alone.
Frequently Asked Questions (FAQs)
1. How is fetal growth monitored during pregnancy?
Fetal growth is typically monitored using fundal height measurements, ultrasound scans, Doppler studies, and other fetal surveillance techniques. These assessments help healthcare providers ensure that the baby is growing appropriately throughout pregnancy.
2. What happens if my baby is measuring small during pregnancy?
If your baby measures smaller than expected, your healthcare provider may recommend additional ultrasounds, Doppler scans, or closer monitoring to determine whether the baby is constitutionally small or affected by fetal growth restriction.
3. How often are growth scans performed during pregnancy?
The frequency of growth scans depends on individual pregnancy risk factors. Women with uncomplicated pregnancies may not require additional scans, while high-risk pregnancies may need monitoring every two to four weeks.
4. Can exercise affect my baby’s growth during pregnancy?
Moderate exercise is generally safe in uncomplicated pregnancies and does not negatively affect fetal growth. Always consult your healthcare provider before starting or continuing an exercise programme during pregnancy.
5. Are repeated ultrasound scans safe during pregnancy?
Current evidence suggests that medically indicated diagnostic ultrasound performed by trained healthcare professionals is safe during pregnancy when used appropriately.
6. Can I monitor my baby’s growth at home?
No. Although you can monitor fetal movements and attend regular antenatal appointments, accurate assessment of fetal growth requires professional clinical examinations and ultrasound measurements.
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Medical Disclaimer!
This article has been reviewed and written under the guidance of our Head Physiotherapist, Dr. Kruti Raj (PT, MUHS,CPT,CMPT). The information shared is intended for educational purposes only and should not be considered a substitute for personalized medical advice, diagnosis, or treatment.
Please consult us or any other qualified healthcare professional before beginning any exercise program, especially if you are experiencing pain, recovering from injury, or managing a medical condition.
