Weeks 18, 19 and 20 of pregnancy

At this point, your body weight may have increased by three to six kilograms, and your stomach will of course be visibly larger.

Ultrasound image

What’s happening to the mother?

You will probably be able to feel your baby moving by now. Women who have given birth before often detect signs of life in their baby earlier than those expecting their first child. The fetus’ movements may feel like gas in your stomach or bowel movements. At first, it may feel like a tiny shivering or tingling in your stomach, and you may not be quite sure what it is.

Your baby’s movements will gradually become more apparent, and you will be in no doubt that it is your baby that is moving.

It is normal to gain 11-16 kilograms in weight during a pregnancy. Much of this weight gain is due to the fact that you are producing more blood and amniotic fluid, and the fact that your womb, placenta and baby are all growing.

In some women, the navel bulges outwards. This is completely harmless and will return to normal by itself after birth.

Development of the fetus

The baby has now begun to make faces and suck its thumb. It reacts to sound and can distinguish between light and darkness.

You might feel fetal hiccups as rhythmic little thumps that come and go. The fetus hiccups because it produces urine and drinks amniotic fluid. This process helps to purify the amniotic fluid.

The baby is now covered in a layer of white fat, which attaches to the hairs on its body. This layer of fat will protect the skin for as long as the baby remains in the amniotic fluid.

The baby will weigh around 350 grams during week 20 of the pregnancy and will be about the size of a honeydew melon. At this stage, most babies are about the same size. This makes it beneficial to determine the due date using ultrasound at this time.

Feel life

Tips for pregnant women on how to monitor your baby’s movements. Information in Arabic, English, Norwegian, Polish, Somali, Spanish, Tigrinya and Urdu.


Information about pregnancy, childbirth and the postnatal period in Arabic, English, Farsi, French, Norwegian, Polish, Somali, Tigrinya and Turkish aimed at immigrants and others with a short period of residence.

Content provided by The Norwegian Directorate of Health

The Norwegian Directorate of Health. Weeks 18, 19 and 20 of pregnancy. [Internet]. Oslo: The Norwegian Directorate of Health; updated Monday, March 7, 2022 [retrieved Monday, May 20, 2024]. Available from: https://www.helsenorge.no/en/pregnancy-and-maternity-care-in-norway/pregnancy-week-by-week/pregnancy-weeks-18-19-and-20/

Last updated Monday, March 7, 2022