Reference Table Fetus Size and Weight
Index
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
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.