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When you are 18 weeks pregnant, some more of your baby’s newborn reflexes are being developed, such as trying to suckle if you would touch his/her lips.

For mom, it might be time for an ultrasound examination. Maybe this will be the first time that you will lay your eyes on your baby, or at least the first time you will actually be able to see your baby in any detail…

Week 17 | Week 19

What to Expect at 18 Weeks Pregnant

Your Baby’s Development

How Big is my Baby at 18 Weeks?

The fetal age of your baby is now 16 weeks.

Your baby is growing (this week too)!

He/she is more than five inches long (12.7 cm) now and probably weighs about 5.5 to about 6.5 ounces (155-184 gram).

Weight has doubled since last week! But from now on, the growth rate will slow down a bit.

Ultrasound Scan in Week 18

In many places, an ultrasound examination is offered at some point between weeks 18 and 20 of your pregnancy. Now your baby has grown so much that an ultrasound can be used to really check that your baby is developing normally.

Depending on where you live and if the pregnancy has been smooth or not, this could be your first ultrasound or just one in a long row. Research has shown that an ultrasound scan helps mom and baby bond, so be sure to take this opportunity to see your baby in action.

Congenital birth defects, multiple pregnancies, growth, due dates, gender, and placental position can all be checked at this point in time.

The video below is just 1 minute from an advanced 18-week ultrasound scan. Pretty, don’t you think?

Fetal Development

Full movement of the arms and legs has been discovered and, believe me, your child will use them!

You may be feeling motion pretty consistently; your little has grown large enough now. If this is the first time you are pregnant, however, it may still take a couple of weeks until you are certain that the butterflies you feel in your stomach are actually messages from your baby.

Whether you feel it or not, your baby is twisting and rolling around.

He/She is mastering a yawn now. :-)

Your child’s nervous system is in a rapid maturing phase and should be in working order by now. Nerves are developing and are now surrounded by myelin that allows the nerve cells to exchange signals.

Week 18 of pregnancy is the last week of the current critical development phase of your baby’s brain, which started back in week 12. The next phase will begin in week 24.

Although the ears may still appear to be sticking away from the head, they are now in the right position. The hearing has become a little bit more sensitive now. Not only are sounds from outside of the womb being heard, but internally as well.

The eyes are looking straight ahead. Studies have shown that at 18 weeks pregnant, the fetus is starting to become sensitive to light. For example, if you spend time in a solarium (not recommended!), your child will turn his/her back against the light.

By now, your doctor should be able to tell the sex of your child. If you are expecting a girl, her fallopian tubes and uterus are in place. Should your child be a male, his genitals are developing and visible in an ultrasound if he does not hide them.

Do you want to know the gender of your baby? Share your opinion in our baby gender poll here.

Now is a fun time to start a baby registry! Amazon’s registry is great!

And you’ll find many other inspiring baby registries listed in this post.

Mom’s Body When 18 Weeks Pregnant

Now the changes of your body are becoming more and more evident: increasing hunger, weight gain, visible changes to your skin.

No worries – these changes are all normal. (Vote in this pregnancy body changes poll and find out what is happening to other pregnant moms’ bodies.)

An increase in hunger is expected… you are eating for two. But remember that those two are you and a still very tiny little friend of yours. Huge calorie intake will put weight on your body, not your baby’s – guaranteed! (Sorry!)

Try to focus appetite towards foods that are high nutrients. To learn more about what recent research teaches us about healthy eating during pregnancy, click here.

Comfort is a must when 18 weeks pregnant. Your tummy is growing larger. Therefore more baggy clothing may work better for you.

Also, find a comfortable way of lying on your side. Ideally, you should be sleeping as much as possible on your left side. That will maximize blood flow and nutrition to your uterus and baby.

By lying on your back, the uterus can fall back and possibly apply undue pressure on a vein. Some moms can almost faint if they lie down on their back or at least they become very uncomfortable and dizzy. At this point your cardiovascular system is already going through changes to accommodate your pregnancy, so don’t put extra pressure on your system by lying on your back.

You may be experiencing dizziness from time to time. As long as this does not occur too frequently you should be OK. Should it occur often maybe discuss it with your doctor? Going from a sitting or laying down position to a standing position should be taken slowly. This will help with your dizzy spells.

You may start to notice unusual marks and/or spots on your skin. Do not panic. These are only temporary. If they appear to be abnormally irritated, talk with your doctor.

You may take precautions such as wearing a hat that covers your face while in the sun, sunscreen, and clothing that keeps your skin hidden from the sun will help. If you are in the sun try to stay shaded as much as possible.

Week 18 Pregnancy Video

Diary of a Daughter

What’s it really like being 18 weeks pregnant…? Here’s a true diary from an 18-weeks-pregnant mom (Me..!)

Now even my hubby can feel our baby’s kicks through my skin. Wonderful! I think we have a very active (and strong!) baby in there.
Otherwise, this has been a calm week. My baby bump is growing.

Are you also 18 weeks pregnant? Please share your experiences and thoughts by leaving a comment below!

Read Next


Mayo Clinic, Mayo Clinic Guide to a Healthy Pregnancy
Joanne Stone MD and Keith Eddleman MD, The Pregnancy Bible: Your Complete Guide to Pregnancy and Early Parenthood
Nilsson, L; Hamberger, L. A Child Is Born
Soderberg, L., Mammapraktika. B Wahlstroms.

Image: Image of 18 weeks belly by Graham and Sheila

Week 17 | Week 19

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