Reaching week 26 of pregnancy means you are in the final stretch of your second trimester, with the third trimester just around the corner. By now your bump is well established, your baby is increasingly active, and you may be starting to think ahead to the arrival. This is a busy and reassuring stage, and understanding what is happening at 26 weeks pregnant can help you feel prepared and confident.
This week often coincides with a cluster of routine antenatal tests and, for some parents, the option of a detailed later-pregnancy scan. Below we walk through your baby's development, the changes in your body, and the appointments and screening that are typically relevant around now. If you would like a personalised overview of your own milestones, our pregnancy journey planner maps the key scans and tests week by week.
Your baby at week 26
At around 26 weeks, your baby is roughly the size of a large aubergine or a head of lettuce. Typically babies at this stage measure approximately 35 centimetres from head to heel and weigh somewhere in the region of 750 to 900 grams, though these are general averages and every baby grows at their own pace.
Development this week is focused on maturing the systems your baby will need after birth. The lungs are continuing to develop the tiny air sacs and the surfactant that will eventually help them breathe independently. Your baby's eyes, which have been fused shut, are beginning to open around this time, and they are becoming more responsive to light filtering through your abdomen.
You may also notice that your baby is settling into more recognisable patterns of activity and rest. Many parents find their baby responds to sound this week, sometimes reacting to familiar voices or louder noises with a kick or a wriggle. These movements are an important sign of wellbeing, and you will gradually get to know your baby's typical rhythm.
Your body at week 26
As your uterus expands to well above your navel, you may be experiencing a range of common late second-trimester symptoms. These often include:
- Backache and pelvic discomfort, as your growing bump shifts your centre of gravity and pregnancy hormones soften your ligaments.
- Braxton Hicks contractions, occasional painless tightenings of the womb that are usually a normal part of pregnancy.
- Swelling in the feet and ankles, particularly towards the end of the day or in warm weather.
- Trouble sleeping, indigestion or heartburn, and the return of tiredness as the third trimester approaches.
- Stronger, more frequent baby movements, which many parents find both reassuring and, at times, surprisingly forceful.
Most of these changes are a normal part of pregnancy at this stage. That said, it is always worth mentioning anything new or worrying to your midwife, particularly sudden or severe swelling, a persistent headache, visual disturbances or a noticeable change in your baby's usual movements, as these can occasionally need prompt assessment.
What to keep in mind this week
Week 26 is a good time to focus on a few practical priorities. Staying well hydrated, moving gently and regularly, and paying attention to your posture can all help with the aches and pains of this stage. Continuing to take note of your baby's movements is important too, and if you ever feel movements have reduced or changed, contact your maternity unit straight away rather than waiting.
Around now, the NHS recommends that pregnant women are offered the whooping cough (pertussis) vaccine, usually available from around 16 weeks up to 32 weeks, to help protect your newborn in their first weeks of life. If you have not yet had it, this is a sensible time to ask your midwife or GP. Discussions about the RSV vaccine, which is offered from 28 weeks, may also come up as you approach the third trimester.
This is also a natural point to begin thinking about your birth preferences, antenatal classes and any adjustments at work, without any pressure to have everything decided at once.
Scans, tests and appointments
Several routine and optional checks tend to fall around this part of pregnancy. Your NHS antenatal schedule will usually include regular midwife appointments where your blood pressure, urine and your baby's growth are monitored.
One key test in this window is the glucose tolerance test (GTT), which screens for gestational diabetes and is typically offered between 24 and 28 weeks for women with relevant risk factors. If you would like more information or a private option, you can read about our glucose tolerance test service.
Week 26 also sits within the window for a later-pregnancy anomaly assessment. While the main NHS anomaly scan is carried out at 18 to 21 weeks, some parents choose an additional detailed scan in the third trimester for extra reassurance about growth, anatomy and wellbeing. Our 3rd-trimester anomaly scan (26–29 weeks) is designed for exactly this stage, offering a thorough review as your baby continues to develop. Later still, in the third trimester, your team may also discuss group B streptococcus with you, but that conversation typically comes closer to term.
Looking ahead
You have covered a great deal of ground, and the finish line is coming into view. If you have just arrived here from week 25, you will notice how quickly things are progressing, and in week 27 you will officially step into the third trimester. Take each week as it comes, keep your antenatal appointments, and lean on your midwifery team whenever you have questions.
At London Pregnancy Clinic, our fetal-medicine specialists are here to support you through every stage, whether you are seeking additional reassurance, a detailed later scan, or expert advice as you approach the third trimester.
This article is for general information only and is not a substitute for professional medical advice. Always speak to your midwife, GP or obstetrician about your own pregnancy.
