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.
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 Age||Length (US)||Weight (US)||Length (cm)||Mass (g)|
|10 weeks||1.22 inch||1.23 ounces||3.1 cm||35 grams|
|11 weeks||1.61 inch||1.59 ounces||4.1 cm||45 grams|
|12 weeks||2.13 inches||2.05 ounces||5.4 cm||58 grams|
|13 weeks||2.64 inches||2.58 ounces||6.7 cm||73 grams|
|14 weeks||5.79 inches||3.28 ounces||14.7cm||93 grams|
|15 weeks||6.57 inches||4.13 ounces||16.7 cm||117 grams|
|16 weeks||7.32 inches||5.15 ounces||18.6 cm||146 grams|
|17 weeks||8.03 inches||6.38 ounces||20.4 cm||181 grams|
|18 weeks||8.74 inches||7.87 ounces||22.2 cm||223 grams|
|19 weeks||9.45 inches||9.63 ounces||24.0 cm||273 grams|
|20 weeks||10.12 inches||11.68 ounces||25.7 cm||331 grams|
|21 weeks||10.79 inches||14.07 ounces||27.4 cm||399 grams|
|22 weeks||11.42 inches||1.05 pounds||29.0 cm||478 grams|
|23 weeks||12.05 inches||1.25 pounds||30.6 cm||568 grams|
|24weeks||12.68 inches||1.48 pounds||32.2 cm||670 grams|
|25 weeks||13.27 inches||1.73 pounds||33.7 cm||785 grams|
|26 weeks||13.82 inches||2.01 pounds||35.1 cm||913 grams|
|27 weeks||14.41 inches||2.33 pounds||36.6 cm||1055 grams|
|28 weeks||14.80 inches||2.67 pounds||37.6 cm||1210 grams|
|29 weeks||15.47 inches||3.04 pounds||39.3 cm||1379 grams|
|30 weeks||15.95 inches||3.44 pounds||40.5 cm||1559 grams|
|31 weeks||16.46 inches||3.86 pounds||41.8 cm||1751 grams|
|32 weeks||16.93 inches||4.31 pounds||43.0 cm||1702 grams|
|33 weeks||17.36 inches||4.77 pounds||44.1 cm||1953 grams|
|34 weeks||17.84 inches||5.24 pounds||45.3 cm||2377 grams|
|35 weeks||18.23 inches||5.72 pounds||46.3 cm||2595 grams|
|36 weeks||18.62 inches||6.20 pounds||47.3 cm||2813 grams|
|37 weeks||19.02 inches||6.68 pounds||48.3 cm||3028 grams|
|38 weeks||19.41 inches||7.13 pounds||49.3 cm||3236 grams|
|39 weeks||19.72 inches||7.57 pounds||50.1 cm||3435 grams|
|40 weeks||20.08 inches||7.98 pounds||51.0 cm||3619 grams|
|41 weeks||20.39 inches||8.35 pounds||51.8 cm||3787 grams|
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.
The different foetal weights corresponding to their pregnancy growth chart in weeks are given below:
Pregnancy week Average, Length (cm), Average Weight (g)
|Pregnancy Week||Average Length (cm)||Average Weight (g)|
The lengths below are measured from crown to heel:
|Pregnancy week||Average 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.
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.
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.
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.
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.
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.
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.
More than 90% of infants born in between 3-4 Kgs which is considered as a normal foetal weight.
By 32 weeks, your infant must weigh around 11 inches (280 millimetres) long from crown to rump and weigh 1-2 kg.
By 7 months, the baby should weigh 1-2 kg.
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.
To determine your Estimated Foetal Weight (EFW), your body goes through ultrasound foetal biometry which is often required during 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
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.