As you come towards the end of your pregnancy, you enter the third trimester, aka, the final stretch before your baby arrives. This is a significant and exciting time when lots of changes happen, and it's important to understand these last few months so that you can be informed and ready for birth.
So, let's take a closer look at what happens in the third trimester of pregnancy and answer some of the questions that expectant parents ask about the third trimester.
When does the third trimester start?
The third trimester starts when the second trimester ends. It begins at the start of the 28th week of pregnancy.
How long does the 3rd trimester last?
The third trimester lasts for 12 weeks or three months.
What changes to your body can you expect to see in the third trimester?
Entering the third trimester means that it's almost time to meet your baby - how exciting!
To help you know what to expect during these last few months, let's run through some of the common third-trimester symptoms that pregnant people experience.
- Acid reflux: Heartburn during pregnancy is common in the third trimester.
- Braxton Hicks contractions: Also known as 'false labour' contractions, these irregular contractions are felt at the front of your bump and are caused by your uterus muscles getting ready to deliver your baby. They last for under 30 seconds up to two minutes, while real contractions initially last between 30 and 90 seconds.
- Breast tenderness: Your boobs may continue to change and become tender during the third trimester as your hormones adapt and prepare them for breastfeeding. Many pregnant people notice that their breasts change the most during the third trimester.
- Difficulty sleeping: You may find it harder to get comfortable in bed during the last few weeks of pregnancy due to your growing bump.
- Haemorrhoids: Also known as piles, these don't just happen during pregnancy, but they are common in the third trimester and are caused by hormones that make your veins relax.
- Lightning crotch: This is a term commonly used by pregnant people to describe a sudden, sharp pain in the pelvic area. This pain is often felt in the lower abdomen and genital region and can be caused by the baby's head pressing against nerves or blood vessels in the pelvic area. While it can be uncomfortable, it is usually a normal part of the third trimester and not a cause for concern. Changing positions, stretching, or taking a warm bath can help.
- Protruding belly button: During the third trimester of pregnancy, it's not uncommon for some women to experience a protruding belly button. This can be due to the growing uterus putting pressure on the abdominal wall, causing the belly button to push outward. While it may look unusual, it's usually nothing to worry about and is a normal part of the pregnancy process.
- Shortness of breath: Your growing uterus puts extra pressure on your diaphragm in the third trimester and can make you feel short of breath. If you're worried about feeling breathless, don't hesitate to speak to your doctor or midwife.
Third-trimester pregnancy: how does your belly change week by week
Your bump will continue to grow and change shape throughout your third trimester as your uterus expands up towards your rib cage.
Your belly may shift downwards as your baby 'drops' into position in preparation for birth, but if your baby is breech - with their bottom or legs down and head up - your bump may be wider or slightly top heavy, and by the end of the third trimester, your bump will be at its biggest.
How does your baby develop in the third trimester
During the third trimester, a baby puts on weight quickly and their body gradually gets more in proportion. Their lungs mature, their eyes open and close, and they can distinguish between light and dark and may startle at loud sounds and sense changes in light. They'll continue to make lots of movements and usually turn into a head-down position by week 36, ready for birth.
Good signs to look out for in the third trimester
Feeling your baby move during the third trimester is one of the best signs that your pregnancy is going well at this late stage.
If you do notice your little one's movements changing and you're at all concerned, it's best to reach out to your doctor and they will be able to carry out any checks - such as a kick count - to confirm that everything's ok.
