Reference Table Fetus Size and Weight

We women are always very curious and concerned with the size and weight of the fetus during pregnancy, wanting to verify with each prenatal and ultrasound consultation that everything is ok. Seeing the baby’s growth week by week at the right pace in addition to head circumference measurements is a delight and having a fetus weight chart that can accompany this development is even better.

Week Head to Butt Size Weight
8 1,6 cm 1 gram
9 2,3 cm 2 grams
10 3,1 cm 4 grams
11 4,1 cm 7 grams
12 5,4 cm 14 grams
13 7,4 cm 23 grams
14 8,7 cm 43 grams
15 10,1 cm 70 grams
16 11,6 cm 100 grams
17 13,0 cm 140 grams
18 14,2 cm 190 grams
19 15,3 cm 240 grams
20 16,4 cm 300 grams

Week Head to Foot Size Weight
21 26,7 cm 360 grams
22 27,8 cm 430 grams
23 28,9 cm 501 grams
24 30,0 cm 600 grams
25 34,6 cm 660 grams
26 35,6 cm 760 grams
27 36,6 cm 875 grams
28 37,6 cm 1005 grams
29 38,6 cm 1153 grams
30 39,9 cm 1319 grams
31 41,1 cm 1502 grams
32 42,4 cm 1702 grams
33 43,7 cm 1918 grams
34 45,0 cm 2146 grams
35 46,2 cm 2383 grams
36 47,4 cm 2622 grams
37 48,6 cm 2859 grams
38 49,8 cm 3083 grams
39 50,7 cm 3288 grams
40 51,2 cm 3462 grams
41 51,7 cm 3597 grams
42 51,5 cm 3685 grams
43 51,3 cm 3717 grams

But we have to remember that each baby develops according to the mother’s health , and also depends on genetic factors such as the parents’ weight and height. The compatibility of these factors is essential at the time of ultrasound , to find out if the weight of the fetus during pregnancy is in agreement and close to what was expected.

The values ​​displayed in the fetus weight table serve as a parameter but should not be taken too literally. It is up to the doctor to know if the growth of the baby week by week is going well for the biotype of the parents and for the gestational age.

IMPORTANT: Women with diabetes, obesity, prolonged pregnancy, advanced maternal age are risk factors for babies larger than what is considered normal.

If your baby is larger than the average gestational age measurements on the fetus weight chart , glucose tests should be taken into account to rule out the possibility of gestational diabetes . In the opposite case with the baby below the average for gestational age, a study should be carried out to find out if the flow from the placenta to the fetus is meeting all the needs that the baby needs.

How to Calculate Fetus Size

Follow the fetus weight chart to help the pregnant women on duty to calculate the weight of the baby that will be born. This was the table I used in the three pregnancies and it can help to quell curiosity a little. Remember that each baby is unique and must be analyzed individually. Don’t be alarmed if the values ​​are not exactly the same as your baby’s measurements. To calculate the size of the baby, multiply the size of the femur by 7 .

Then you will know the approximate size of the baby. If the measurement was 2.3 cm, for example, then it will be 2.3 cm x 7 = 16.1 cm, that is, your baby is 16 centimeters. In the first stage, the baby’s size can be measured from head to bottom . Soon, it will grow and the size and weight of the fetus during pregnancy will only be measured in parts, being thus calculated by this method of multiplication.

Questions from Readers:

How to Increase Fetus Weight During Pregnancy?

If during the ultrasound exams it is found that the fetus is underweight, the obstetrician may indicate the introduction of some foods that will assist in weight gain as foods rich in protein. Some vitamin supplements can also be introduced, but it should only be done on medical advice.

How to Know if the Weight of the Fetus Is Normal?

Only a doctor specialized in ultrasound can check and verify through the measurements of the fetus and the images captured during the examination that the weight of the fetus is within the expected for the gestational age or not. Through the examination report, all information must be included for the obstetrician to examine during the prenatal consultation .

What Influence on Fetus Weight?

The weight of the fetus is directly linked to the mother’s diet and gestational health. It is not eating for two, but doubling the good diet following a menu rich in vitamins such as omega 3, folic acid, vitamins A and C in addition to the minerals iron, calcium, phosphorus and zinc. It is worth noting that the use of gestational multivitamins should be used since the discovery of pregnancy, already at the beginning of prenatal care, since it is practically impossible to ingest all of these vitamins with meals. These vitamins are complete with iron, folic acid and all other vitamins of extreme importance for fetal development. Famivita has developed a multivitamin called FamiGestathat supplies all these vitamin needs, with a small difference from the others, the size of the pill, which is much easier to ingest. You can get it here in our online store.  Problems with the placenta can also influence the weight of the fetus and should be ascertained with caution.

See Also:  Head Perimeter: Baby’s Head Size Chart in Pregnancy

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My name is Dr. Alexis Hart I am 38 years old, I am the mother of 3 beautiful children! Different ages, different phases 16 years, 12 years and 7 years. In love with motherhood since always, I found it difficult to make my dreams come true, and also some more after I was already a mother.

Since I imagined myself as a mother, in my thoughts everything seemed to be much easier and simpler than it really was, I expected to get pregnant as soon as I wished, but it wasn’t that simple. The first pregnancy was smooth, but my daughter’s birth was very troubled. Joana was born in 2002 with a weight of 2930kg and 45cm, from a very peaceful cesarean delivery but she had already been born with congenital pneumonia due to a broken bag not treated with antibiotics even before delivery.

Dr. Alexis Hart

My name is Dr. Alexis Hart I am 38 years old, I am the mother of 3 beautiful children! Different ages, different phases 16 years, 12 years and 7 years. In love with motherhood since always, I found it difficult to make my dreams come true, and also some more after I was already a mother. Since I imagined myself as a mother, in my thoughts everything seemed to be much easier and simpler than it really was, I expected to get pregnant as soon as I wished, but it wasn’t that simple. The first pregnancy was smooth, but my daughter’s birth was very troubled. Joana was born in 2002 with a weight of 2930kg and 45cm, from a very peaceful cesarean delivery but she had already been born with congenital pneumonia due to a broken bag not treated with antibiotics even before delivery.

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