FW In Pregnancy- Foetal Length And Weight Chart In kg And Grams By Week

FW In Pregnancy- Foetal Length And Weight Chart In kg And Grams By Week

14 Dec 2017 | 8 min Read


Author | 1369 Articles

As your pregnancy advances, you will notice a gradual increase in the size of your baby bump. This indicates that your baby is advancing at a healthy rate, as it should. In this post, we give you interesting details about how your baby develops inside your womb, every week-s development, as well as their size. Let’s understand more about the foetal weight, foetal growth chart week by week and how the development of your baby takes place during pregnancy.

Know How Big Is Your Baby In Foetal Growth Chart By Weeks

Are you curious about your baby’s size each week of your pregnancy? You can get an idea of your baby’s size by looking at the figures in our chart below. The foetal weight chart in grams, length, and inches listed below ranges from top to bottom (crown to rump).

Gestational AgeLength (US)Weight (US)Length (cm)Mass (g)
10 weeks1.22 inch1.23 ounces3.1 cm35 grams
11 weeks1.61 inch1.59 ounces4.1 cm45 grams
12 weeks2.13 inches2.05 ounces5.4 cm58 grams
13 weeks2.64 inches2.58 ounces6.7 cm73 grams
14 weeks5.79 inches3.28 ounces14.7cm93 grams
15 weeks6.57 inches4.13 ounces16.7 cm117 grams
16 weeks7.32 inches5.15 ounces18.6 cm146 grams
17 weeks8.03 inches6.38 ounces20.4 cm181 grams
18 weeks8.74 inches7.87 ounces22.2 cm223 grams
19 weeks9.45 inches 9.63 ounces24.0 cm273 grams
20 weeks10.12 inches11.68 ounces25.7 cm331 grams
21 weeks10.79 inches14.07 ounces27.4 cm399 grams
22 weeks11.42 inches1.05 pounds29.0 cm478 grams
23 weeks12.05 inches1.25 pounds30.6 cm568 grams
24weeks12.68 inches1.48 pounds32.2 cm670 grams
25 weeks13.27 inches1.73 pounds33.7 cm785 grams
26 weeks13.82 inches2.01 pounds35.1 cm913 grams
27 weeks14.41 inches2.33 pounds36.6 cm1055 grams
28 weeks14.80 inches2.67 pounds37.6 cm1210 grams
29 weeks15.47 inches3.04 pounds39.3 cm1379 grams
30 weeks15.95 inches3.44 pounds40.5 cm1559 grams
31 weeks16.46 inches3.86 pounds41.8 cm1751 grams
32 weeks16.93 inches4.31 pounds43.0 cm1702 grams
33 weeks17.36 inches4.77 pounds44.1 cm1953 grams
34 weeks17.84 inches5.24 pounds45.3 cm2377 grams
35 weeks18.23 inches5.72 pounds46.3 cm2595 grams
36 weeks18.62 inches6.20 pounds47.3 cm2813 grams
37 weeks19.02 inches6.68 pounds48.3 cm3028 grams
38 weeks19.41 inches7.13 pounds49.3 cm3236 grams
39 weeks19.72 inches7.57 pounds50.1 cm3435 grams
40 weeks20.08 inches7.98 pounds51.0 cm3619 grams
41 weeks20.39 inches8.35 pounds51.8 cm3787 grams

How Is Foetal Weight Estimation Done?

During early pregnancy, between 6 to 9 weeks, a dating scan is performed. In this procedure, the doctor measures the length of the foetus from the head to the buttocks using an ultrasound. This is also known as Crown-rump length (CRL). After this, an anomaly scan is performed between 18 to 20 weeks. By this time, your baby will likely have grown substantially, and the doctor will be able to measure their  head circumference, abdominal girth, and thigh bone length. In the later stages, growth scans and colour dopplers are also performed to assess the baby’s growth.

What Is The Normal Foetal Weight Estimation By Week?

The different foetal weights corresponding to their pregnancy growth chart in weeks are given below:

Pregnancy week Average, Length (cm), Average Weight (g)

Pregnancy WeekAverage Length (cm)Average Weight (g)

The lengths below are measured from crown to heel:

Pregnancy weekAverage Length (cm)Average Weight (g)

Please note that the numbers in these foetal weight charts are based on international guidelines and may vary from one baby to another. If the doctor finds that the baby’s weight and length is significantly lower than expected for that stage of pregnancy as compared to Indian benchmarks, they may ask you to undergo further tests for detecting anomalies.

How Are Babies Measured In The Womb?

Measuring the fundal height of the expectant mother is the simplest approach to determine the size of the baby in the womb. The fundal height is the measurement in centimetres from the pubic bone to the top of the uterus. To estimate the size of your baby, your doctor will also palpate your abdomen.

What Foetal Weight Is Considered Below Average?

If the foetal weight is below average, as determined by the ultrasound measurements and your weight gain, then the obstetrician might advise a bunch of other tests like amniocentesis, where birth defects of the baby can be identified, leading to poor weight gain.

Foetal Growth: 8-19 Weeks Of Pregnancy

By the time you reach the eight week of pregnancy, your baby will continue growing rapidly, and on performing an ultrasound, you will notice a fluttering on the screen along with a heart beat. You can also track your foetal heart rate to keep an eye on heart development and baby movement in womb.

During this time, your baby’s tiny fingers and toes will grow longer, and joints, muscles, and bones will also begin to form.

Between the 15th to 16th week of pregnancy, your baby’s skin will start developing and the protective coat, Vernix caseosa will begin to form in week 19. The vernix caseosa, a thin, white layer, shields your baby’s skin from the amniotic sac’s aqueous environment.

Your abdomen will also grow rapidly, and you will also experience discomfort in the ligaments, accompanied by itchy skin. This is also the time when stretch marks start to appear. Stretch marks cannot be avoided, but applying lotion to the skin helps stop itching and dryness. You can also have a look at pregnancy week by week, which can serve as a roadmap for your pregnancy care.

Foetal Growth: 20-40 Weeks Of Pregnancy

The midpoint of a typical pregnancy is the 20th week.During this time, your baby will grow, both in length and weight. Your baby will mostly  weigh more than one pound and be at least eight inches long by the 21st week. 

By 40 weeks, the foetus will be fully developed and ready to live outside the womb. You may also feel prepared to deliver your baby by this time and go into labour around the time of your expected due date. In case you do not deliver by the 42nd week, your doctor may look into clinical methods to induce labour and prepare your body for childbirth. 

What Does It Mean If Your Baby Is Not In The Right Size During Pregnancy?

Improper baby weight is typically linked to maternal risk factors such as foetus malformations, placental issues, pregestational diabetes, smoking, drinking alcohol, viral infections, malaria, hypertension, or perhaps a mix of these issues. Some risk factors can be controlled easily, while others may require medical intervention. 

How Fundal Height Helps Doctor To Check Baby’s Growth?

According to the World Health Organisation (WHO), measuring foetus growth is fundal height. The measurement is described as the length in centimetres from your pubic bone to the top of your uterus. If the infant is small for gestational age, it can help to determine its fundal height.


What is the normal foetal weight in kg?

More than 90% of infants born in between 3-4 Kgs which is considered as a normal foetal weight.

What should a 32 week foetus weigh?

By 32 weeks, your infant must weigh around 11 inches (280 millimetres) long from crown to rump and weigh 1-2 kg.

What is the weight of a baby in 7 months pregnant in kg?

By 7 months, the baby should weigh 1-2 kg.

Why do I need a 32 week ultrasound?

Ultrasounds are required to make sure that your baby’s growth is continuing along the growth curve. At 28, 32, and 36 weeks, they are finished. Your fundal height is one way doctors determine whether your baby is developing as anticipated or not.

Is EFW A baby weight?

To determine your Estimated Foetal Weight (EFW), your body goes through ultrasound foetal biometry which is often required during pregnancy.

What is normal EFW in pregnancy? 

EFW in pregnancy at 16–20 weeks adjusted for gestational age is around 234 (30) grams and birth weight adjusted for gestational age around 3518 (420) grams.


The stages of foetal development is closely monitored by the foetal growth chart. The doctor examines any aberration found during routine measurements to see whether action is required or not. In order to make sure that the charts are tracked appropriately, it is advised to have all of the required pregnancy scans and checkups done properly on time.

Disclaimer: The information in the article is not intended or implied to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of your doctor.

Also Read: Understanding Baby Weight Gain

#pregnancymustknow #pregnancymustknow

Related Searches

Ovulation Calculator: Are you planning to have  perfect sex with your partner and start a family? You need to know the most fertile days and for that ovulation calculator tool is here to help you out with planning the best time to be intimate with your partner.

Foetal Movement Week By Week: One of the most thrilling experiences of pregnancy is to feel your baby kicking or moving inside your womb. Know how foetal movement gets developed weekly  inside your womb. 



Related Topics for you