18 Weeks Pregnant
Your 18th week begins
18/40
weeks
23 weeks left
Your 18th week begins

18 Weeks Pregnant

Your 18th week begins

17 19
18/40
Weeks

23 weeks to go

Your baby is about the size of a pear.

Your baby this week

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Click the purple button for more details

This Week

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The baby is already beginning to have breathing movements, but still receives all oxygen through the placenta. Do you think that this week the baby is already hearing the parents’ voices? Continue Reading

Your summary

  • Development Breathing movements begin as a training. The placenta still provides all the oxygen your baby needs.
  • Tips Start using specialized creams or oils to help prevent stretch marks.
  • How many months is 18 weeks? 18 weeks pregnant is 5 months. With week 18 of pregnancy, you are in the second week of your 5th month.


DAY 1 • OF WEEK 18

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Uterine height is the measurement the obstetrician takes every month at prenatal appointments to assess the baby’s growth, and to check if it’s within expectations for gestational age. Measurement starts from week 16, when the uterus begins to rise above the pelvic bone… Continue Reading

DAY 2 • OF WEEK 18

Insect repellent for pregnant women

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With so many cases of dengue and Zika occurring in the country, pregnant women need to be extra cautious. Using trusted and pregnancy-safe products is essential! Choose long-lasting and high-protection products, such as Exposis Repellent…

DAY 3 • OF WEEK 18

Among the biggest anxieties of moms-to-be are the growing belly and the baby’s first movements. The sensation of feeling them move for the first time is like little butterflies fluttering in your belly. It’s wonderful!

DAY 4 • OF WEEK 18

IMPORTANT: One of the biggest fears of pregnant women is labor, especially anesthesia. There are so many myths and stories about the subject that they keep many expectant moms up at night. In fact, with advances in medicine, everything has become much more comfortable and safer.

DAY 5 • OF WEEK 18

Pregnant at the beach

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Pregnant women can also enjoy the summer and have fun at the beach, as long as they take some precautions. If you like to get in the water, pay attention to the depth and the impact of the waves on your belly. Be careful with food, sun exposure, and stay well hydrated! Continue Reading

DAY 6 • OF WEEK 18

How to involve dad during pregnancy

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The idea of the dad just being a supporting character during pregnancy is a thing of the past! Dads can be 100% involved and enjoy every second with mom. Take part in checkups, choosing the layette, preparing the baby’s room, and every detail involving the baby… Continue Reading

DAY 7 • OF WEEK 18

IMPORTANT: Toothache is one of the worst pains there is, and even worse when it happens during pregnancy. Not all medications can be taken and not all dental treatments can be done. That’s why extra care in this phase is very necessary.

key info box:

  1. The baby at 18 weeks of pregnancy has lanugo (body hair) already visible. Starts to make breathing movements, but of course, it’s just practice, as the placenta still supplies all the baby’s oxygen needs.
  2. Another important development this week is that the baby starts to simulate breathing movements even though it’s not yet needed, as he’s still just swallowing amniotic fluid.
  3. The 18th week is often marked by the appearance of spots and pimples, mainly on the face.
  4. Weight gain is usually rapid at this stage. So, watch your diet, avoid excesses and anything that could further increase your weight or ill health during pregnancy, including the baby’s health.
  5. Don’t leave getting the baby’s layette ready for the last minute. After all, you never know when your baby will arrive and making decisions when you should be just waiting can be very stressful.

Your baby this week

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Click the purple button for more details

More information about 18 weeks of pregnancy

The baby at 18 weeks of pregnancy already has lanugo visible1. Lanugo? Yes, that fine layer of tiny hairs covering the baby’s body! Your little one may be 14.2 cm long and weigh about 190 grams! Growing noticeably, more and more each day. The baby is starting to make breathing movements. But it’s just practice, as the placenta supplies all the baby’s oxygen needs.

baby development 18 weeks

Don’t be surprised if you see your little one sucking their thumb or hands during an ultrasound. Babies love doing that at this stage. Moms, remember each baby and mom is different. The fetus’s height and weight can vary according to the parents’ biotypes, okay?

Baby’s development

At 18 weeks, a major milestone is the development of hearing2. Baby can already hear your heartbeat and the inner sounds of blood flowing in the umbilical cord or your stomach working. In a few days, your baby will be able to hear noises and voices from outside your womb and start to recognize your voice.

Another important change this week is that your baby already simulates breathing movements even though it’s not yet required, since they are still only swallowing amniotic fluid. Their little eyes are now sensitive to light and react to stimuli from outside. The intestines are still developing and begin to produce meconium (first stool) from the amniotic fluid that the baby swallows.

How mom is feeling…

At 18 weeks, women often notice the appearance of spots and pimples, especially on the face. Of course, not every woman gets the same symptoms, but this is a time when these changes are common. It all happens due to hormone levels, which are like a rollercoaster.

18 weeks pregnant

Weight gain is usually rapid at this stage. That’s why you should watch your diet, avoid excesses, and everything that could further increase your weight or harm your health during pregnancy, including your baby’s. Another point worth noting: dizziness often appears this week, due to the heart working harder as pregnancy progresses. This causes your blood sugar to drop, compressing the veins and causing dizziness, and in some cases even fainting3. Getting up slowly and resting whenever possible is best at this stage to avoid possible accidents.

Have you started the layette? Have you decided which hospital you’ll use for delivery? Maybe it’s time to start preparing everything. Don’t leave those decisions for the last minute. After all, you never know when the baby will arrive, and making decisions when you should just be waiting is very stressful. Take advantage of your energy levels—they’re still high, and your belly isn’t getting in the way yet—to do everything you need to prepare.

External factors

Your bump is already getting rounder and it’s easy to see you’re pregnant. It may still be just a small bulge, but it’ll get bigger every week from now on. It’s only a matter of time. The curiosity to know the baby’s gender is very common and by this stage, it’s usually possible to know from an ultrasound. If you’ve already found out, enjoy the pink or blue world and make all your plans and purchases as you wish.

Photo: Inese_Dunajeva

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23 weeks to go

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23 weeks left

References:

For us, credibility and transparency are essential. That’s why our articles are written and reviewed by specialists in the field. This article was written and reviewed by:
Gynecologist and Obstetrician
CRM-SP 178668 / RQE 90102
Medical reviewer graduated from the State University of Pará, specialist in gynecology, obstetrics, and human reproduction from UNIFESP.
Maternity Expert
After trying to conceive for 7 years and now a mother of 3, Patricia is the author and creator of the Trocando Fraldas portal and the Famivita brand.

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