20 Weeks Pregnant With Twins: Ultrasound, Belly Pictures & Symptoms

Learn about twin ultrasound and pregnancy symptoms from week 19+0 to 19+6. Look at belly pictures at 20 weeks pregnant with twins.

By Kate Phillipa Clark

When you’re 20 weeks pregnant with twins, you’re in the second half of your pregnancy. In the second half of your pregnancy, you can measure babies from crown to heel. This is the equivalent of standing height in older persons. Your babies will be approximately 25,5 cm (10.04 inches) from crown to heel when you’re 20 weeks pregnant with twins. However, most sonographers use a multi-parameter assessment to indirectly determine the growth and well-being of the babies. Standard parameters are:

  • Biparietal diameter (BPD) – the transverse diameter of the head
  • Head circumference (HC)
  • Abdominal circumference (AC)
  • Femur length (FL) – the length of the long bone in the human thigh.

Ultrasound – anomaly scan

If you haven’t had one already, you’ll have the anomaly scan in this week or next week, at the latest. This is an ultrasound scan to check that your babies are growing and developing as expected. The sonographer will be able to look for conditions like spina bifida, which affects the spinal cord. This is also the scan where the sonographer can look for the sex of the babies.
If you’re pregnant with identical twins who share a placenta, you’re more at risk of pregnancy complications compared to women pregnant with fraternal twins. You need to make sure that your sonographer knows about conditions like Twin to Twin Transfusion Syndrome. If not, you need to be referred to someone who does.

Baby size & development

When you’re 20 weeks pregnant with twins, the babies are beginning to distinguish between different flavors. This is because your babies are drinking from the amniotic fluid. It tastes differently depending on what you – the mother – has eaten. Babies prefer sweet, and this is exactly how breast milk and infant formula taste. The innate reflexes – such as sucking the thumb and drinking amniotic fluid – become conscious. Both are important for the babies survival after birth.

Pregnancy symptoms & belly pictures

  • You might begin to notice that your navel is “turning inside out,” because your uterus has grown bigger.
  • If you haven’t felt your babies move yet, you should soon. However, be aware that it depends on how your babies and the placenta(s) are positioned in your uterus. You might not feel an actual kick right away. It may feel more like bubbles in your stomach.
  • If you suffer from hyperemesis gravidarum – excessive nausea and vomiting – the symptoms may not clear up completely until your babies are born. Some women experience that some symptoms improve at around 20 weeks.
  • You might feel constipated, have headaches or be more tired than before you got pregnant. Making a few changes in your diet may give you more energy.

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Pregnancy diet, nutrition & prenatal vitamins

Some women experience that a supplement of magnesium is helpful if they feel very tired and worn out. You can also eat foods high in magnesium. Choose green vegetables, nuts and whole grains. Remember to take an iron supplement if your doctor or midwife recommends it.


Previous week – 19 weeks pregnant with twins

Next week – 21 weeks pregnant with twins


About the Author

Kate Phillipa Clark

Kate Phillipa Clark has a bachelor in Journalism and an Executive Master in Corporate Communication. She is an identical twin and so is her father.


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