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Pregnancy weight gain BMI

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Why should I take the test?💡 

Now that you’re pregnant, you’re consuming food not just for you but also for your baby. The amount of weight you gain during pregnancy is important for the health of your pregnancy and the long-term health of you and your baby. 

To tailor the best pregnancy for you and your little one, you should consider how much weight you should gain based on your body mass index (BMI) before pregnancy. BMI is a measurement of body fat that uses your height and weight to determine if your weight is in the healthy range. 

How is the test done?💉 

Jump on the scale. Know your height. You can use a BMI calculator or plug numbers in the following BMI formula calculations.

Metric units: BMI = weight (kg) / height² (m)

US units: BMI = weight (lb) / height² (in) * 703


TMI from Baby Billy👩‍⚕️: 

There’s no one-size-fit-all definition of weight gain for all pregnant moms. BMI assists you along the journey of healthy weight gain during pregnancy.

General guidelines for pregnancy weight gain if you carry one baby


BMI before pregnancy weight

Recommended weight gain

Underweight (BMI<18.5)

28-40 pounds (13-18kg)

Normal weight (BMI 18.5-24.9)

25-35 pounds (11-16kg)

Overweight (BMI 25-29.9)

15-25 pounds (7-11kg)

Obese (BMI>30)

11-20 pounds (5-9kg)


General guidelines for pregnancy weight gain if you carry twins


BMI before pregnancy weight

Recommended weight gain

Underweight (BMI<18.5)

50-62 pounds (23-28kg)

Normal weight (BMI 18.5-24.9)

37-54 pounds (17-25kg)

Overweight (BMI 25-29.9)

31-50 pounds (14-23kg)

Obese (BMI>30)

25-42 pounds (11-19kg)


If I’m overweight…

Overweight leads to various complications such as gestational diabetes, preeclampsia and other high blood pressure disorders of pregnancy. Gaining too much weight than the recommended weight also leads to a delivery of a baby that is too large. Therefore, a balance between nutrition and physical activity is critical to maintain your weight in the healthy range. 

If I’m underweight…

It’s essential to gain a reasonable amount of weight gain to keep your baby and you healthy. Gaining less than the recommended weight is associated with delivering a baby that is too small or prematurely born. Hence, the baby is vulnerable to illness and may experience some development delays.   

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