20 weeks pregnant with twins: Twin pregnancy week by week

Read about your twin pregnancy from week 19+0 to 19+6. You’re now 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.

How are my babies developing?

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.

How might I feel?

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 the uterus. You might not feel an actual kick right away. It may feel more like bubbles in your stomach.
You might feel constipated, have headaches or be more tired than before you got pregnant. Some experience that a supplement of magnesium is helpful. You can also eat foods high in magnesium. Choose green vegetables, nuts and whole grains.

What do I need to remember?

Iron supplements, if your doctor or midwife recommends it.

The woman in this picture is 19+0 weeks pregnant with twins. She’s a first time mom.


The woman in these pictures is 19+4 weeks pregnant with twins. This is her fourth pregnancy.


The woman in this picture is 19+5 weeks pregnant with twins. The twins are her babies #2 and #3.


The woman in this picture is 20 weeks pregnant with twins. She’s a first time mom.


Read about next week – week 21


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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