Ultrasound Has Two Fetal Sacs, But One Is Small, Dangerous?

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Dear doctor, When the first ultrasound at the age of 4 weeks was seen only one fetal bag. And in the second ultrasound at 6 weeks, two fetal sacs were seen which the doctor said were twins. But one bag is normal size while the other one looks small. Both are visible fetuses that are still flat. But the age of the fetus, heart rate, and length of the fetus are the same. Is it a problem when the twins have different fetal sac sizes despite the same age, heart rate and fetal length? Thank you

1 Answer:

Good morning, thanks for asking at HealthReplies.com. Fetal sac, in medical terms is called a gestational sac (GS). Small GS, regardless of whether you are having a twin pregnancy or not, can mean several things, including:

There was an error in estimating gestational age. So in this case, it means the pregnancy sac one is large, and what is thought to be small is actually normal.
Potential for miscarriage
Potential for certain genetic disorders
Potential fetal developmental disorders


So indeed what you have to do now is to have your pregnancy checked regularly by the obstetrician so that if things happen that are not desirable, they can be treated immediately. In addition, maintain the health of your fetus by not worrying too much, getting enough rest, avoiding consumption of caffeine, multiply the consumption of nutrient-rich foods such as vegetables, fruits, and consumption of pregnancy vitamins as recommended, do not engage in strenuous activities and avoid smoking. So, hopefully answering your question.

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