13 Weeks Pregnant – What To Expect In Week 13

13 Weeks Pregnant - What To Expect In Week 13

When you’re 13 weeks pregnant, you are entering the more enjoyable second trimester.

Congratulations for making it through the first trimester!

You’ve made it through one third of your pregnancy.

The next three months are the ‘pregnancy honeymoon period’.

Typically, your morning sickness has or will end very soon.

In fact you’re probably noticing your appetite has returned and you’re enjoying food again.

13 Weeks Pregnant – What To Expect

Just remember you don’t have a licence to ‘eat for two’ while pregnant.

It’s still important to go for nutritious foods over highly processed junk.

Your baby’s future health is impacted by your health during pregnancy.

Now you’re 13 weeks pregnant, your moods have likely settled a little more, and you should start to feel more energetic.

And you’re probably busting to tell everyone your good news!

Most parents-to-be wait until the second trimester to let everyone in on their secret.

This is because the risk of miscarriage has now reduced significantly.

There’s no hard and fast rule on when you should announce your pregnancy.

Most pregnant women wait until after the 12 week scan.

Don’t be surprised if some people have already guessed, especially if your first trimester was a bit rough.

The important thing is, you share the news when and how you want to.

And ask others to respect that it’s your news to announce and leave it to you to spread the word.

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13 Weeks Pregnant – Symptoms

Most women find at 13 weeks of pregnancy, their pregnancy symptoms change.

Instead of coping with morning sickness and extreme fatigue, there’s new things to expect and cope with.

These include:

  • Increased vaginal discharge. This milky coloured thin fluid is called leukorrhea and increases as your pregnancy progresses. It’s caused by rising levels of oestrogen and blood flow to the pelvis, and acts to prevent infection and promote healthy bacteria in your vagina.
  • Visible veins. You might’ve noticed a spidery network of blue veins appearing on your breasts, hands or even your belly. This is due to the increase blood volume and is normal.
  • Increased sex drive. It’s common for women to feel a sudden jump in their sex drive around the second trimester. But your partner isn’t! Check out BellyBelly’s article Pregnant And He Doesn’t Want Sex Or Closeness? This Could Be Why… for more information.
  • Breast changes. Pregnancy affects your breast tissue in anticipation of breastfeeding your newborn. This means increased size, darkening of the area around the nipple (areola) and your nipples increasing in size.

The second trimester is a wonderful chance to really enjoy being pregnant.

It’s also a great time to take up some pregnancy classes or get back into doing some daily exercise if you haven’t been able to maintain it through the first trimester.

Now you’re not looking to nap every afternoon and feeling seasick if you move, a walk or exercise class is a great idea.

13 Weeks Pregnant – Your Baby

Your baby at 13 weeks pregnant is almost fully developed.

Now your baby just needs to mature and grow.

Your baby has fully functioning kidneys and starts to pass urine regularly. This is formed as your baby swallows amniotic fluid.

The spleen has developed and begins to create red blood cells.

Your baby’s intestines, which were growing inside the umbilical cord, move to the abdomen.

The eyes are in the correct place but remain shut.

This is to protect the eyes as they continue to develop.

Your baby’s vocal cords are now forming.

Movements increase but it’s unlikely you’ll be able to feel these movements at week 13.

You might be surprised to know your baby can suck a thumb or fingers.

Your baby’s head is now only a third of the size of the body.

Baby even has a unique set of fingerprints!

The placenta is growing, in anticipation of your baby’s development in the coming months.

By the time you give birth, the average placenta weighs around 500g.

So you’ll have something else to blame your weight gain on!

An ultrasound of your baby at 13 weeks could detect your baby’s gender but it’s not very accurate.

If you want to find out, the most accurate time is the 18-20 week ultrasound.

In the meantime, you can check out some old wives tales in our just-for-fun article, boy or girl?

When you’re 13 weeks pregnant, your baby measures approximately 7-8cms long and weighs around 23 grams. Your baby is about the size of a peach.

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Last Updated: December 24, 2018


Kelly Winder is the creator of BellyBelly.com.au, a writer, doula (trained in 2005), and a mother of three awesome children. She's passionate about informing and educating fellow thinking parents and parents-to-be, especially about all the things she wishes she knew before she had her firstborn. Kelly is also passionate about travel, tea, travel, and animal rights and welfare. And travel.

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