Week 13 Pregnancy

Second Trimester

Last reviewed: July 2026

13 weeks pregnant at a glance

You are in the second trimester.
Your baby is roughly the size of a peach.
Routine midwife check-ups will now be scheduled every few weeks depending on your care pathway.
Every pregnancy is different, so don't worry if your experience varies slightly.

You are 13 weeks pregnant and in your second trimester. Your baby is about the size of a peach. This week's key development: Closing the First Chapter. NHS note: Routine midwife check-ups will now be scheduled every few weeks depending on your care pathway.

The Dating Scan Window

Between weeks 10 and 14, you'll be offered your first ultrasound scan. This dates your pregnancy more accurately and checks for multiple babies.

This page is for general pregnancy planning and date guidance only. It is not medical advice, diagnosis, or treatment. Pregnancy dates are estimates and can change after a scan or advice from your midwife, GP, or maternity team. Always speak to a qualified healthcare professional if you have symptoms, concerns, or questions about your pregnancy.

Week 12

Week 14

Baby's Development

Your baby is about the size of a peach.

Closing the First Chapter — Your baby's vocal cords are forming, and the intestines are settling into their permanent home inside the abdomen. Fingerprints are developing — entirely unique to this little person. The first trimester is almost behind you; you've done something remarkable.

Peach

Approx. 7.4cm

Your Symptoms

Increased sex drive
Visible bump
Leaking breasts (rarely, but possible)

Every pregnancy is different. You may experience all, some, or none of these symptoms — and that's completely normal. If anything concerns you, speak to your midwife.

NHS Appointments

Routine midwife check-ups will now be scheduled every few weeks depending on your care pathway.

Practical Advice for Week 13

Nutrition

Continue vitamin D (10mcg) daily throughout pregnancy.
Increase your calorie intake slightly — you need around 200 extra calories per day in the second trimester.
Eat oily fish (salmon, sardines, mackerel) up to twice a week for omega-3.
Whole grains provide sustained energy and are rich in B vitamins.

Exercise

Second trimester energy often returns — enjoy getting active again.
Start sleeping on your side, especially your left — it improves blood flow to the placenta.
Pregnancy yoga can help with flexibility and relaxation.
Walking groups or buddy systems can keep you motivated.

Wellbeing

Increased sex drive is common in the second trimester — it's perfectly safe.
Your bump may be starting to show — enjoy the milestone.
If breasts are leaking, it's colostrum — completely normal, even this early.
This trimester is often called the 'golden period' — try to enjoy it.

Preparation

Your midwife appointments will now be scheduled every few weeks.
If you haven't already, tell your employer — they need to conduct a workplace risk assessment.
Start looking at maternity clothing — your regular clothes may be getting tight.
Research childcare options if you plan to return to work — UK waiting lists can be long.

Tip of the Week

Start sleeping on your side (preferably left) as it's better for blood flow to the placenta.

Frequently Asked Questions for Week 13

How many months is 13 weeks pregnant?

At 13 weeks pregnant, you are roughly 3 months pregnant. Remember that pregnancy is typically measured in weeks rather than months for clinical accuracy.

What size is the baby at 13 weeks?

At 13 weeks, your baby is roughly the size of a peach (about 7.4cm). Your baby's vocal cords are forming, and the intestines are settling into their permanent home inside the abdomen. Fingerprints are developing

What are the common symptoms at 13 weeks pregnant?

Common symptoms at this stage include increased sex drive, visible bump, leaking breasts (rarely, but possible). Remember that every pregnancy is unique, and it's normal to experience different symptoms.

Is 13 weeks in the second trimester?

Yes, 13 weeks falls within the second trimester.

Are there any NHS appointments at 13 weeks?

Routine midwife check-ups will now be scheduled every few weeks depending on your care pathway.