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How Much Does Your Baby Weigh In The Womb?

You don’t have to wait until s/he is born to take care of your baby, because you’ll have started taking care of them while they’re still in your womb. How, you ask? Your diet, habits, and behavior directly affect your baby. So it is really important for you to maintain a healthy lifestyle.

One of the key factors to note during a baby’s development is baby weight. After the ultrasound scan is done, the doctor may tell you that your child is overweight or underweight. This article will help you figure out exactly what it means, and how you can find out more.

How Do We Measure the Fetal Weight?

When the radiologist conducts your ultrasound, they measure your baby’s weight by one of these methods:

1. Biparietal diameter (BPD)

2. Femur length (FL)

3. Head circumference (HC)

4. Occipitofrontal diameter (OFD)

5. Abdominal circumference (AC)

6. Humerus length (HL)

After noting down the above parameters, doctors apply a formula to find the weight of the baby. Even if it’s not exactly the same, the baby’s weight will be more or less that number.

What Is the Fetal Specific Model Weight?

The model fetal weight is the average weight of the baby in the womb, which is considered to be the average weight of many healthy infants. But the actual weight of the your baby might be different than one that is given here.

Average Weight Of The Fetus During Pregnancy: (in weeks)

Week of Pregnancy

Weight of the baby (in grams)

8

1

10

4

12

14

14

43

15

70

16

100

18

190

20

300

22

430

23

501

24

600

25

660

28

1005

30

1319 (or 1 kg)

33

1918

35

2383 (or 2kg 200 grams)

36

2622

37

2859

38

3083

39

3288

40

3462

41

3597

42

3650 (or 3kg 400 grams)


If you observe the table above, you notice that your child begins to grow significantly from your third trimester onwards. After the 35th week the baby increases its weight by 200 grams per week.

This is an average chart and babies usually are at this weight in the womb.

At birth, the infant’s weight is around 2.8kg - 3.6kg. If the baby is less than 2.5kg, it can be considered a low birth weight, and at this point, the health of your baby becomes more important.

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