Weeks 17 to 20 can bring several new experiences. You may begin to feel movement, your bump may become more noticeable, and the mid-pregnancy or anomaly scan is usually planned during this period. Some people feel more energetic, while others continue to have nausea, fatigue, pain, heartburn, constipation, anxiety or poor sleep. There is no required golden phase.
This guide explains what may change from week to week, how early movements can feel, when movement needs medical attention, what the anomaly scan can and cannot tell you, what to review during antenatal care in India, and which symptoms should never be ignored.
Quick answer
At a glance
- At week 17 the fetus is approximately 12 cm from head to bottom; at week 18 about 14.2 cm; and at week 19 about 15.3 cm.
- At week 20 many guides change to a head-to-heel measurement, which is approximately 25.6 cm. This is why the week-20 figure looks much larger.
- Movement is usually first felt between 16 and 24 weeks. In a first pregnancy, it may not be recognised until after 20 weeks.
- If you have not felt movement by 24 weeks, contact your maternity service. Once you know your baby's usual pattern, call immediately for less movement, no movement or a change in that pattern.
- The level-II or anomaly scan is generally planned around 18 to 20 weeks in the current ICMR workflow; some services use an 18-to-21-week window.
- The anomaly scan is screening, not a guarantee. It cannot detect every condition and may lead to repeat imaging or specialist follow-up.
- In India, fetal sex determination and disclosure are prohibited under the PC-PNDT Act.
- Bleeding, watery fluid leakage, severe pain, fever, severe headache or vision changes, sudden swelling, one-sided leg symptoms, chest pain or sudden breathlessness need urgent assessment.
How your baby develops from week 17 to week 20
The measurement method matters during this stage. NHS week-by-week guidance measures from the head to the bottom at weeks 17 to 19, then changes to head-to-heel at week 20. The figures should not be compared as though they use the same method.
Around week 17
The fetus is approximately 12 cm from head to bottom. The body is growing more in proportion to the head, the skeleton continues to harden, and the nervous system is developing. The fetus may react to loud sounds, but hearing is still developing.
Around week 18
The fetus is approximately 14.2 cm from head to bottom. Hearing continues to develop, movements become stronger, and reflexes are becoming more organised. You may begin to notice flutters, bubbles or gentle tapping, but it is also normal not to feel movement yet.
Around week 19
The fetus is approximately 15.3 cm from head to bottom. The limbs are more proportionate and movement continues to develop. A bubbling feeling that seems like wind may sometimes be an early movement.
Around week 20
The fetus is approximately 25.6 cm from head to heel. This larger figure reflects a change in measurement method rather than a sudden one-week growth jump. The anomaly scan may be performed around this time, depending on your facility and appointment schedule.
These are approximate population measurements. Dating differences, fetal position and normal biological variation affect what is seen on an individual scan.
Understanding your baby's first movements
Early movement may feel like fluttering, swirling, bubbles, flicks or gentle taps. Movement is usually first felt between 16 and 24 weeks. If this is your first pregnancy, you may not recognise it until after 20 weeks.
In the early weeks, movements may be occasional and irregular because you are still learning what they feel like and a daily pattern may not yet be established. There is no single correct number of movements for every baby.
When to contact your maternity service
- If you have not felt any movement by 24 weeks, tell your obstetrician or maternity service.
- Once you know your baby's usual pattern, call immediately if movement is less than usual, stops, or changes noticeably.
- Do not wait until the next day or wait for 24 hours to pass.
- If you are worried before a clear pattern has developed, contact the maternity service rather than trying to decide alone.
- Do not use a home Doppler to decide that the baby is well. Hearing a heartbeat does not reliably show fetal wellbeing.
Talking, singing and music
Talking or singing can be a meaningful family ritual, but there is no need to play music directly to the abdomen or repeat a particular song for brain development. At this stage hearing is still developing, and evidence does not support promises that specific sounds will improve intelligence, memory or later comfort.
The anomaly or level-II scan
The current ICMR normal-pregnancy workflow lists a level-II ultrasound between 18 and 20 weeks. NHS guidance commonly uses 18 to 21 weeks, and exact scheduling can vary by facility. Ask where the scan will be done, whether preparation is required, and when the report will be reviewed.
What the scan may examine
The sonographer assesses fetal growth and looks at structures such as the brain, face, spine, heart, abdomen, kidneys, bladder, limbs and abdominal wall. The placenta, amniotic fluid and other pregnancy features may also be reviewed. The exact protocol depends on the facility.
What the scan cannot guarantee
- It is a screening scan, not proof that every organ or chromosome is normal.
- Some conditions are easier to see than others, and the scan cannot detect everything.
- Fetal position or image quality may prevent all views from being completed.
- A repeat appointment may be needed if clear views are not obtained.
- An unexpected or uncertain finding may lead to specialist review, additional scans, counselling or diagnostic testing.
Choice, questions and legal context in India
Ask what is being screened, what a result means, what the limitations are and what the next options would be. In India, prenatal diagnostic techniques are regulated under the Pre-conception and Pre-natal Diagnostic Techniques (Prohibition of Sex Selection) Act. Fetal sex determination and disclosure are prohibited. The purpose of the scan is health assessment, not sex determination.
Antenatal care during weeks 17 to 20
Carry your ANC or Mother and Child Protection card, previous scan and laboratory reports, vaccination record and current medicine list. Do not stop or change prescribed medicines or supplements without professional advice.
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Review your symptoms
Discuss movement, pain, heartburn, constipation, swelling, sleep, headaches, urinary symptoms, discharge, mood and any change that affects daily activity.
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Check blood pressure, urine and haemoglobin follow-up
Antenatal review may include blood pressure, weight, urine testing, pallor or haemoglobin assessment and examination for swelling. Follow the test and treatment plan advised for your individual pregnancy.
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Continue prescribed iron-folic acid and calcium
Food alone should not replace prescribed treatment. If your clinician has prescribed iron-folic acid and calcium, take them as directed and at the separated times advised.
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Review Td vaccination
Confirm whether your first or second tetanus-diphtheria dose or a booster is due based on your pregnancy and previous vaccination record.
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Book or review the level-II scan
Confirm the scan date and where the report will be discussed. Ask what follow-up is planned if some views are incomplete or an unexpected finding is reported.
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Know where to obtain help
Keep the clinic or hospital contact number and know where to go at night, on weekends or if you develop a warning sign.
Common symptoms and safer self-care
Back, hip and pelvic pain
Pregnancy-related ligament, posture and load changes can contribute to back or pelvic pain. Use safe lifting technique, supportive flat footwear, regular position changes and ordinary pillows between the knees, behind the back or under the abdomen if comfortable. No special pillow or support belt is essential.
Ask for clinical review if pain is persistent, severe, affects walking or sleep, or limits daily activity. Urgent assessment is needed when pain occurs with fever, bleeding, watery fluid leakage, painful urination, side pain, weakness, numbness or loss of sensation.
Heartburn and indigestion
Hormonal changes and pressure from the growing uterus can contribute to heartburn. Smaller meals, avoiding meals close to bedtime, sitting upright after eating and identifying personal triggers may help. Chaas, jeera or other household foods may suit some people but are not treatment and may worsen symptoms in others.
A pharmacist or clinician can advise on medicines that are suitable in pregnancy. Seek assessment for severe pain, difficulty swallowing, vomiting blood, black stools, persistent vomiting or symptoms that do not improve.
Constipation
Gradually increase fibre through vegetables, fruit, pulses and whole grains, drink enough fluid for your needs and remain active if you are able. Iron supplements and other medicines can contribute, but do not stop prescribed iron without advice. Prunes can be an ordinary food; ghee is not an established constipation treatment.
Ask a pharmacist or clinician about pregnancy-suitable treatment if lifestyle measures are not enough. Seek medical advice for severe abdominal pain, vomiting, blood in the stool, a swollen abdomen or persistent constipation.
Swelling and leg symptoms
Gradual swelling in both feet or ankles can occur, particularly after standing or in hot weather. Resting with the feet raised, comfortable footwear and gentle movement may help. Do not rely on salt restriction as the response to pregnancy swelling.
Contact your maternity service immediately for sudden swelling, swelling of the face or hands, severe headache, visual changes, pain below the ribs, vomiting or feeling very unwell. One-sided leg pain, swelling, redness or warmth also needs urgent assessment.
Sleep and leg cramps
Sleep can be disrupted by movement, pain, worry, heartburn or leg cramps. Use comfortable positioning and ordinary pillows as needed. For cramp, gentle stretching and movement may help. One-sided persistent calf pain or swelling should not be assumed to be a cramp.
Nutrition, iron and calcium
A varied Indian diet can combine grains or millet, dal or another protein source, vegetables, fruit and pasteurised dairy or an alternative. No individual food can guarantee fetal growth, improve intelligence or correct anaemia.
Iron and haemoglobin
Leafy vegetables, pulses, beans, sesame, eggs and appropriately cooked meat can contribute iron. Pomegranate, dates and jaggery may be included as foods, but they should not be presented as anaemia treatment. Haemoglobin testing and clinician-directed iron-folic acid remain central.
Protein and calcium
Use protein sources that fit your diet and budget, such as dal, beans, chickpeas, eggs, fish, meat, paneer, curd, milk, soy foods or nuts and seeds. Calcium-containing foods can support intake, but continue clinician-directed supplements when prescribed.
Food safety
Use pasteurised milk and dairy products, cook eggs, meat and fish appropriately, wash produce and avoid raw or undercooked animal foods. Do not add herbal products, high-dose vitamins or multiple prenatal supplements without checking the ingredients with a clinician.
Walking, exercise and prenatal yoga
If your pregnancy is uncomplicated and your clinician has not restricted activity, regular moderate movement can support general health. Walking, gentle strength work, stretching or prenatal yoga may be suitable when adapted to your experience and symptoms.
- Begin gradually if you were previously inactive.
- Use a qualified instructor who understands pregnancy modifications.
- Avoid activities with a high risk of falling, collision or abdominal injury.
- After the first trimester, avoid remaining flat on your back for long periods during exercise; change position if you feel dizzy, breathless or unwell.
- Stop and seek advice for bleeding, watery fluid leakage, chest pain, painful contractions, dizziness, severe breathlessness, calf pain or swelling, or any symptom that concerns you.
When to seek urgent medical help
Get emergency help now
Go to the nearest emergency department or call local emergency services for:
- heavy bleeding, severe persistent abdominal pain, fainting or collapse
- chest pain, sudden severe breathlessness, coughing blood or severe difficulty breathing
- a seizure, loss of consciousness or new severe weakness
- severe pain with dizziness, pallor, sweating or a feeling that something is seriously wrong
Contact your obstetrician, maternity service or hospital promptly for:
- less movement, no movement or a noticeable change in the baby's usual pattern - call immediately and do not wait until the next day
- no movement felt by 24 weeks
- any vaginal bleeding or watery fluid leaking from the vagina
- persistent vomiting, inability to keep fluids down, very little urine or signs of dehydration
- a temperature of 38 C or above, chills or feeling acutely unwell
- a severe or persistent headache, blurred vision, flashing lights, pain below the ribs or sudden swelling
- one-sided leg swelling, warmth, redness or pain
- severe or worsening abdominal, back or pelvic pain
- pain or burning when urinating, reduced urine or side pain
- stress, anxiety, panic, low mood or intrusive thoughts affecting daily life; seek emergency help if you may harm yourself or someone else
Related pregnancy guides
For the stage immediately before this one, read '13 to 16 Weeks Pregnant: Symptoms, Baby Movement and Antenatal Care'.
For broader evidence-based food and supplement guidance, read MomCare Haven's pregnancy nutrition guide.
This guide focuses specifically on weeks 17 to 20: first movements, the change in fetal measurement method, the anomaly scan, common symptoms and warning signs.
Common questions
Is it normal not to feel movement at 20 weeks?
It can be, especially in a first pregnancy. Movement is usually first felt between 16 and 24 weeks. Contact your maternity service if you have not felt movement by 24 weeks.
Should I count kicks at 18 or 20 weeks?
A formal daily count is not required for everyone. Early movements may be irregular. The important step later is to learn your baby's usual pattern and seek help immediately if it reduces, stops or changes.
Can I use a home Doppler when I am worried?
No. Finding a heartbeat can be difficult, and hearing one does not reliably show that the fetus is well. Contact your maternity service instead.
Does a normal anomaly scan guarantee a healthy baby?
No. A normal result is reassuring for the conditions and structures assessed, but the scan cannot detect every condition or guarantee how the rest of the pregnancy will progress.
Can the scan reveal the baby's sex in India?
Fetal sex determination and disclosure are prohibited in India under the PC-PNDT Act. The scan is performed to assess health and development.
Do I need a pregnancy pillow or maternity belt?
No special product is routinely required. Ordinary pillows, position changes and suitable footwear may help. Persistent or limiting pain needs clinical review rather than a product alone.
Are pomegranate, dates or jaggery enough to prevent anaemia?
No. They can be included as foods, but they do not replace haemoglobin testing, prescribed iron-folic acid or treatment of the cause of anaemia.
The bottom line
Weeks 17 to 20 are important because movement may begin and the anomaly scan is usually planned. The most useful priorities are:
- use week-specific development measurements and remember that the method changes at week 20
- expect movement sometime between 16 and 24 weeks without creating a deadline at week 20
- contact the maternity service immediately for less movement, no movement or a changed established pattern
- do not use a home Doppler for reassurance
- understand that the anomaly scan is screening and cannot detect every condition
- attend antenatal follow-up and review blood pressure, urine, haemoglobin, Td vaccination, medicines and supplements
- use food for balanced nutrition rather than as a substitute for anaemia assessment or treatment
- use ordinary comfort measures first and seek help for persistent pain rather than relying on a pillow or belt
- seek prompt care for bleeding, fluid leakage, severe pain, fever, headache or vision changes, sudden swelling, DVT symptoms, chest pain or breathlessness
Pregnancy experiences differ. You do not need to feel energetic, glowing or emotionally calm to be progressing normally, and you deserve help whenever symptoms or worry affect daily life.
Sources
Accessed 21 July 2026.
NHS. Indigestion and heartburn in pregnancy.
NHS. Pelvic pain in pregnancy.
NHS. Swollen ankles, feet and fingers in pregnancy.
NHS. Headaches in pregnancy. Page last reviewed 23 September 2025.
NHS. Pregnancy symptoms you need to get help for. Page last reviewed 24 June 2026.
NHS. Mental health in pregnancy. Page last reviewed 11 March 2026.
American College of Obstetricians and Gynecologists. Exercise During Pregnancy.
NHS. DVT (deep vein thrombosis).
What this means for you
People begin to notice movement at different times. The anomaly scan can identify some conditions, but it cannot find everything or guarantee that a baby has no health problem. If your baby's movements reduce or change after you have started noticing them, contact your maternity service promptly rather than waiting or relying on a home Doppler.
About this article
Researched and written by the MomCare Haven Editorial Desk using the reliable sources listed above. This article has not been reviewed by an external medical specialist.
Medical disclaimer
This article provides general educational information and does not replace personalised medical advice, diagnosis or treatment. Pregnancy care, scans, medicines, supplements, vaccines and activity recommendations should be decided with a qualified clinician who knows your health history and local services. Seek urgent medical help for warning signs or whenever you feel seriously unwell.
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