Pregnancy Scans Week by Week | 6–40 Weeks Guide

Pregnancy Scans Week by Week: What Can You See on an Ultrasound from 6 to 40 Weeks?

Wondering what your baby looks like at 6, 8, 12, 16 or 24 weeks? Pregnancy is full of exciting milestones, and an ultrasound scan can offer a glimpse of how your little one is developing.

But what can you actually see at different stages of pregnancy? When can you see a heartbeat? When can you find out your baby's gender? And when is the best time to have a 3D or 4D baby scan?

In this guide, we explain the different stages of pregnancy, what an ultrasound may show and the private pregnancy scan options available at Future Baby 4D.

Please remember: every pregnancy develops differently. The images and information available during a scan depend on gestational age, baby's position, equipment and individual circumstances.

Pregnancy scans at a glance

| Pregnancy stage | What you may be able to see |

| 6–7 weeks | Early pregnancy structures; sometimes an embryo and heartbeat | | 8–10 weeks | A more recognisable developing baby and heartbeat | | 11–14 weeks | Baby's overall shape, movement and dating measurements | | 15–16 weeks | More developed features; gender may be identifiable in suitable conditions | | 17–23 weeks | More detailed views of the baby's body and movements | | 24–26 weeks | Developing facial features; an early opportunity for 3D/4D images | | 27–32 weeks | Often a popular window for 3D and 4D facial images | | 33–40 weeks | Baby is more developed, but position and available space can affect the views |

6 weeks pregnant: Can you see a baby on an ultrasound?

Six weeks can feel very early, and it is natural to have lots of questions.

At this stage, an ultrasound may show an early pregnancy sac, yolk sac and a very small embryo. A heartbeat may sometimes be visible, but it is not always possible to see everything clearly at this early stage.

An internal (transvaginal) ultrasound may be recommended by a qualified healthcare professional when an earlier or clearer view is needed. Whether this is appropriate depends on the individual circumstances and consent.

Which scan might be suitable?

An early pregnancy scan may be considered from around 6 weeks, depending on the service criteria and clinical circumstances.

If you have pain, bleeding or other concerning symptoms, contact your maternity team, GP or early pregnancy unit. A private reassurance scan is not a substitute for urgent medical assessment.

7–8 weeks pregnant: Is the heartbeat visible?

As pregnancy progresses, the embryo becomes easier to identify on ultrasound. A heartbeat may be visible, and measurements may help estimate the stage of pregnancy.

However, dates calculated from your last menstrual period do not always match the exact stage of development. Ovulation and implantation can happen later than expected.

If the findings are uncertain, further assessment or a repeat scan may be needed. One very early scan should not be used to make assumptions about pregnancy outcome without appropriate clinical assessment.

Considering an early pregnancy scan?

Future Baby 4D offers early pregnancy scanning for people seeking an additional opportunity to view their pregnancy. Find out more about our early pregnancy scans.

9–12 weeks pregnant: Your baby is becoming more recognisable

During these weeks, your baby continues to develop rapidly. The head, body, arms and legs become more recognisable, and movement may be visible during an ultrasound.

The NHS usually offers a dating scan between 11 and 14 weeks. This scan is used to estimate gestational age, calculate an estimated due date and check whether you are expecting one baby or more. It may also form part of NHS screening, if you choose to have it.

A private scan does not replace the NHS dating or screening scan.

13–14 weeks pregnant: What can you see?

At this stage, your baby has a more recognisable shape. Depending on the baby's position and the quality of the images, you may see the head, body, arms and legs moving.

Some parents begin thinking about finding out their baby's gender around this time. However, an ultrasound gender assessment is generally more suitable a little later, and a clear view cannot be guaranteed.

15–16 weeks pregnant: When can you find out your baby's gender?

One of the most frequently asked questions is: “How many weeks pregnant do I have to be to find out if I'm having a boy or a girl?”

Gender scans are commonly offered from around 15–16 weeks, subject to the clinic's minimum gestation policy.

During a gender scan, the sonographer attempts to identify the baby's sex using ultrasound views. The result depends on factors such as:

• The baby's position.
• Whether the relevant area can be seen clearly.
• The stage of pregnancy.
• Image quality and individual circumstances.

Sometimes the baby may be in a position that makes it difficult to obtain a clear view. A result cannot be guaranteed.

Future Baby 4D offers gender scanning for parents who would like to find out their baby's sex. Visit our website for current availability and booking details.

17–23 weeks pregnant: What does your baby look like?

Your baby is growing and becoming more developed. During this period, an ultrasound may show more detail of the baby's body, limbs and movements.

You may also notice more movement in your pregnancy, although when movements are first felt varies from person to person.

The NHS offers a mid-pregnancy screening scan, commonly called the 20-week scan, usually between 18 and 21 weeks. This is an important screening examination that checks for signs of certain physical conditions and assesses aspects of your baby's development.

A private wellbeing scan is different from the NHS anomaly scan. It does not provide the same screening examination and should never be used as a replacement.

24–26 weeks pregnant: Is this a good time for a 4D baby scan?

This is an exciting stage for parents who are looking forward to seeing more of their baby's face.

A 3D ultrasound creates a three-dimensional image, while 4D ultrasound shows moving 3D images in real time. Depending on the baby's position, you may see facial features, movements, hands and other details.

At this stage, some babies may still have a relatively slim facial appearance. The quality of the images depends on the baby's position, available space, fluid and other factors.

If you are considering a 4D scan, it is worth discussing the most suitable appointment window with your scanning provider.

27–32 weeks pregnant: A popular time for 4D and HD Live scans

Many parents choose this period for a 4D baby scan because facial features may be more developed while there may still be enough room for the baby to move into a suitable position.

You may be able to see your baby:

• Moving their mouth.
• Opening or closing their eyes.
• Stretching or moving their hands.
• Turning their head.
• Bringing their hands towards their face.

Every scan is different. A baby's position, hands near the face, placenta position and other factors can affect the images. A particular facial view cannot be guaranteed.

At Future Baby 4D, our 3D, 4D and HD Live scan options give parents an opportunity to see their baby in more detail, subject to suitable views being obtainable.

33–40 weeks pregnant: Can you still have a 4D scan?

Yes, a scan may still be possible later in pregnancy, depending on the service and individual circumstances.

However, as your baby grows, there may be less room to move into a suitable position. This can make it harder to obtain clear facial images.

If your main reason for booking is to see your baby's face in 3D or 4D, it is sensible to discuss timing with the clinic before choosing an appointment.

What types of pregnancy scans are available at Future Baby 4D?

We offer a range of private scanning and testing services across our clinics in Reading, Leicester and Peterborough.

Early pregnancy scans

For parents seeking an additional early view of their pregnancy. These scans may be available from around 6 weeks, depending on the service criteria and clinical circumstances.

Dating scans

An ultrasound to estimate gestational age and provide an estimated due date. This is not a replacement for the NHS dating scan or screening.

Wellbeing scans

An opportunity to view your baby and assess selected features within the scope of the service. A private wellbeing scan is not a full fetal anomaly examination.

Gender scans

For parents who would like to find out their baby's sex. Availability depends on gestational age and the ability to obtain suitable views.

3D, 4D and HD Live scans

An opportunity to see your baby's features and movements in three dimensions and in real time, where suitable images can be obtained.

Growth scans

An ultrasound assessment of selected growth measurements. If there are concerns about your baby's growth or wellbeing, you should contact your NHS maternity team for appropriate clinical assessment.

SneakPeek gender DNA testing

A blood-based test offered to people who want to find out their baby's sex earlier than a traditional ultrasound gender scan. Please check the test's eligibility, limitations and current turnaround time before booking.

NIPT testing

Non-invasive prenatal testing (NIPT) is a screening blood test that assesses the chance of certain chromosomal conditions. It is not a diagnostic test and does not replace NHS screening or clinical advice.

Fertility and IVF scans

We also offer fertility-related ultrasound services and blood testing, including services that may support people undergoing fertility investigations or treatment. The appropriate tests depend on the individual's clinical needs and the requirements of their fertility team.

Frequently asked questions about pregnancy scans

1. Can I have a pregnancy scan at 6 weeks?

An early pregnancy scan may be available from around 6 weeks. At this stage, the findings can be very small and may not always be conclusive. The appropriate scan type and timing depend on your circumstances.

2. Can you see a heartbeat at 6 weeks?

Sometimes, yes. However, it may be too early to see a heartbeat clearly, particularly if your dates are earlier than expected. If the findings are uncertain, further assessment may be needed.

3. When is the best time for a gender scan?

Many private clinics offer gender scans from around 15–16 weeks. The baby's position and the quality of the view affect whether the sex can be identified.

4. Can you find out your baby's gender at 12 weeks?

An ultrasound gender assessment at 12 weeks is not generally as reliable as one performed later. If you want to find out by ultrasound, check the clinic's minimum gestation policy.

5. What is the best week for a 4D baby scan?

Many parents choose between approximately 27 and 32 weeks, although suitable timing varies. Baby's position and other factors influence the images.

6. Is a 4D scan the same as a 3D scan?

No. A 3D scan produces a three-dimensional image. A 4D scan shows moving three-dimensional images in real time.

7. Does a private pregnancy scan replace an NHS scan?

No. Private reassurance, wellbeing, gender and 4D scans do not replace NHS antenatal appointments, dating scans, anomaly scans or screening tests.

8. Can a pregnancy scan detect every problem?

No. Ultrasound scans cannot identify every condition or guarantee that a baby has no health problems. Continue with your recommended NHS antenatal care and screening. 9. What if my baby is in the wrong position during a 4D scan?

The baby's position can affect image quality. Sometimes the sonographer may suggest allowing time for the baby to move or arranging another appointment, depending on the clinic's policy. A clear facial image cannot be guaranteed.

10. Where can I book a private pregnancy scan?

Future Baby 4D has clinics in Reading, Leicester and Peterborough. You can view our services, choose your preferred location and check available appointments through our website.

Book your pregnancy scan with Future Baby 4D

Whether you are looking for an early pregnancy scan, a gender scan, a wellbeing scan or a special 4D experience, Future Baby 4D is here to help you explore the available options.

We welcome families at our clinics in:

• Reading
• Leicester
• Peterborough

Explore our services and book online: www.futurebaby.co.uk

Important information: Private scans are offered within the scope of the service described at booking. They do not replace NHS maternity care, screening or diagnostic examinations. If you experience bleeding, abdominal pain, severe pain, or any other worrying symptoms, contact your maternity team, GP or NHS 111 as appropriate. If you are concerned about reduced or changed baby movements, contact your maternity unit immediately rather than booking a private scan.