The woman can gain between 7 and 15 kg during the nine months or 40 weeks of gestation, always depending on the weight she had before she became pregnant. This means that the woman should gain about 2 kg in the first three months of pregnancy. From the 4th month of pregnancy, the woman should gain weight, on average, 0.5 kg per week, for a healthy pregnancy.
Therefore, if the body mass index (BMI) of the woman when becoming pregnant is normal, it is acceptable to fatten between 11 and 15 kg during pregnancy. If the woman is overweight, it is important that she does not gain more than 11 kg. However, if the pre-gestational weight is too low, it is possible for the mother to fatten more than 15 kg to produce a healthy baby.
In cases of twin pregnancies, the pregnant woman can gain more weight by 5 kg than the pregnant women of only one baby, also according to the weight she had before becoming pregnant and her BMI.
Find out how many pounds you can gain weight in pregnancy
Enter your data here to know how many kilos you can gain weight in this pregnancy:
Attention: This calculator is not suitable for multiple pregnancies.
Although pregnancy is not the time to dieting or dietary restriction, it is important for a woman to eat healthy, exercise regularly, and have weight gain under control to ensure good postpartum recovery and baby too.
See our tips for not gaining weight in the right way:
How to calculate weight that can gain weight
If you prefer to calculate the weight you can put on weight manually and follow your weight progress every week, you should calculate your BMI before becoming pregnant and then compare it with the values in the table:
| BMI (before pregnancy) | Classification of BMI | Recommended weight gain (until the end of gestation) | Classification for weight chart |
| > 29 | Obesity | 7 Kg minimum | THE |
| 26 to 29 | Overweight | 7 to 11 kg | B |
| 19.8-26 | Normal | 11 to 15 kg | W |
| <19.8 | Under weight | 12 to 18 kg | D |
Now, knowing what your rating for the weight chart (A, B, C or D) you should put a ball corresponding to your weight this week, in the following chart:
Thus, over time, it is easier to see if the weight remains within the recommended range for the letter assigned to it in the table. If the weight is above the range it means that the weight gain is being very fast, but if it is below the interval it can be a sign that the weight gain is not enough and it can be recommended to consult the obstetrician.
