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Your pregnancy and baby guide

You and your baby at 13 weeks pregnant

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Your baby at 13 weeks

Your baby weighs around 25g.

Your baby's ovaries or testes are fully developed inside their body, and the genitals are forming outside their body.

Where there was a swelling between the legs, there will now be a penis or clitoris growing, although you will not usually be able to find out the sex of your baby at an ultrasound scan at this stage.

You at 13 weeks

If you've been feeling sick and tired with morning sickness, you'll probably start to feel better when you're around 13 or 14 weeks pregnant.

Some women start to experience an increased sex drive around this time, possibly as a result of pregnancy hormones or increased blood flow to the pelvic area. Some women do not, and this is perfectly normal. Read more about sex in pregnancy.

You'll notice a small bump developing as your womb grows and moves upwards. If you've been feeling the urge to pee more often over the last few months, it's because your womb was pressing on your bladder. This should ease off now.

See your doctor if you notice any pain when you pee. Urinary tract infections can happen in pregnancy, and it's important to treat them quickly to reduce the risk of kidney infection.

Things to think about

Find out about the pregnancy care you can expect if you're having twins.

You're advised to have your whooping cough vaccination between 16 and 32 weeks of pregnancy.

Find out about gestational diabetes and how you'll be screened for it.

If you're pregnant or have children under the age of 4 you may be entitled to vouchers for milk, fruit, vegetables and formula milk, if you receive certain benefits or you're under 18.

The Start4Life site has more about you and your baby at 13 weeks of pregnancy.

You can sign up for Start4Life's weekly emails for expert advice, videos and tips on pregnancy, birth and beyond.

Go back to 12 weeks pregnant

Go to 14 weeks pregnant

See 3 to 42 weeks of pregnancy

Page last reviewed: 04/10/2019
Next review due: 04/10/2022