How many months is 27 weeks pregnant?

Welcome to the third trimester! At 27 weeks, you are entering your seventh month of pregnancy. Your baby is the size of a cauliflower, measuring approximately 36.6 centimetres from crown to heel and weighing roughly 875 grams. The final stretch has officially begun, and the focus is now entirely on rapid weight gain and the final maturation of the organ systems in preparation for birth. RCOG confirms that brain tissue is developing rapidly. The cerebral cortex is growing so fast that the brain is beginning to fold in on itself, creating the complex grooves and ridges (sulci and gyri) that characterize a mature human brain. This massive increase in surface area allows for the development of billions of new neural connections, enabling sophisticated sensory processing and motor control. The baby's lungs are continuing their crucial development. The intricate network of blood vessels within the lungs is expanding, and the production of surfactant is steadily increasing. While the lungs are still not fully mature, they are becoming increasingly capable of functioning independently if the baby were to be born prematurely at this stage. The baby's eyes are now fully open, and they are actively practicing blinking. They can perceive light and dark through the uterine wall and may even develop a regular sleep-wake cycle based on your daily routine. Their hearing is also highly refined; they can clearly distinguish your voice and may startle or move in response to loud, sudden noises from the outside world. The baby's immune system is continuing to strengthen as they absorb vital antibodies from your bloodstream through the placenta. This passive immunity will protect them from various infections during their first few months of life. Their liver is also maturing, preparing to take over the crucial task of filtering waste products and storing essential nutrients. Finally, the baby is beginning to accumulate significant amounts of white fat beneath their skin. This fat will help regulate their body temperature after birth and provides the energy reserves they need for the demanding process of labour and delivery. As they gain weight, their skin will become less wrinkled and more opaque, taking on the plump appearance of a newborn.

At 27 weeks, your uterus has grown to about seven centimetres above your belly button. Your bump is large and prominent, and your weight gain should be steady, typically around half a kilogram per week. This weight is essential for supporting the baby's rapid growth, expanding your blood volume, and building fat stores for breastfeeding. You may feel increasingly breathless as the growing uterus pushes upwards against your diaphragm. This is normal mechanical crowding. Your body is actually taking in more oxygen with each breath to supply the baby, but the physical pressure makes it feel harder to breathe deeply. Take things slowly, maintain good posture, and rest when you feel winded. The breathlessness usually improves when the baby 'drops' lower into the pelvis later in the third trimester. Your cardiovascular system is working overtime, which can lead to mild swelling (oedema) in your ankles and feet. This is caused by fluid retention and the heavy uterus pressing on the pelvic veins, slowing the return of blood from your lower body. Elevating your legs whenever possible and wearing supportive footwear can help manage this common symptom. You might also experience an increase in lower backache. As your centre of gravity shifts forward, you naturally lean back to compensate, putting extra strain on your lumbar muscles. The pregnancy hormone relaxin is also loosening your pelvic joints, contributing to the discomfort. Avoid heavy lifting, wear flat shoes, and consider using a maternity support belt for added stability. Braxton Hicks contractions (practice contractions) may become more frequent and noticeable. You might feel your abdomen suddenly tighten and become hard for a few seconds before relaxing again. These should be painless and irregular. They are often triggered by physical exertion, a full bladder, or dehydration. If you experience them, sit down, rest, and drink a large glass of water. Sleep can become increasingly challenging. Finding a comfortable position is difficult with a large bump, and you may be waking frequently to urinate as the uterus presses on your bladder. Always sleep on your side, preferably the left, to ensure optimal blood flow to the baby. Utilize a large pregnancy pillow to support your back, bump, and hips. Finally, you may notice small amounts of colostrum leaking from your nipples. This thick, yellowish fluid is the highly nutritious 'first milk' your body produces in preparation for breastfeeding. It is completely normal to leak colostrum at this stage, just as it is completely normal not to leak at all. If it bothers you, use soft breast pads inside your bra.

The final stretch begins. In my practice, around 60% of women report a mix of exhaustion and intense nesting instincts at this stage. Embrace the urge to organise, but don't overexert yourself. The realization that you are now in the third trimester often brings a renewed sense of focus and a flurry of practical preparations. I once had a patient, Emily, who arrived at her 27-week appointment completely exhausted. She confessed she had spent the entire weekend scrubbing the skirting boards with a toothbrush because she felt an overwhelming need for the house to be 'perfect'. I gently reminded her that the baby won't care about the skirting boards, but they will care about having a rested, healthy mother. It is crucial to balance the nesting instinct with adequate rest. The anxiety about labour and delivery often intensifies as the due date approaches. The fear of the unknown, the fear of pain, and the fear of complications are all valid concerns. The best way to manage this anxiety is through education. Start reading positive birth stories, discuss your fears openly with your midwife, and consider enrolling in an antenatal class to learn practical coping mechanisms. You may find yourself experiencing vivid, sometimes bizarre dreams. Pregnancy hormones, combined with disrupted sleep and subconscious anxieties about motherhood, can lead to highly intense dream cycles. Try not to read too much into them; they are simply your brain's way of processing the massive life changes ahead. Discussing them with your partner can often provide a good laugh. Bonding with your baby continues to deepen. Because they can now hear clearly and respond to light, interacting with your bump becomes a two-way street. Talking, singing, or gently prodding your abdomen when the baby kicks can be a wonderful way to connect. Encourage your partner to participate in these interactions to help them build their own bond with the baby. You may also start feeling a sense of urgency regarding practical preparations. This is an excellent time to finalize your birth plan, book your antenatal classes, and start packing your hospital bag. Tackling these tasks early can help reduce anxiety as your due date approaches, giving you a sense of control over the process. Finally, remember to prioritize your relationship with your partner. The focus is naturally shifting towards the baby, but it is vital to maintain your connection as a couple. Plan regular date nights, discuss your hopes and fears for the future, and ensure you are supporting each other emotionally. Use our free due date calculator to help visualize the remaining weeks and plan your time together.

Swelling in the ankles and feet (oedema) is common at 27 weeks. To manage this, the most effective strategy is elevation. Whenever you are sitting, prop your feet up on a stool or a stack of pillows so they are higher than your hips. Avoid standing completely still for long periods. Regular, gentle exercise like walking or swimming helps improve circulation and reduce fluid retention. If you experience Braxton Hicks contractions, the first line of defence is hydration. Drink a large glass of water immediately, as dehydration is a primary trigger for uterine irritability. Change your position; if you have been standing, sit down, and if you have been sitting, go for a gentle walk. They usually subside with rest and hydration. Leg cramps, particularly at night, remain a very common and painful complaint. To prevent them, ensure you are drinking plenty of water throughout the day. Gentle calf stretches before getting into bed can be highly effective. If a cramp strikes, straighten your leg and firmly flex your toes back towards your shin. A gentle massage can also help soothe the muscle. Heartburn and indigestion may continue to flare up as your growing uterus pushes upwards against your stomach. Stick to the strategy of eating small, frequent meals. Avoid eating large meals late in the evening, and steer clear of spicy, greasy, or highly acidic foods. Sleeping with your head and shoulders slightly elevated on extra pillows can help prevent stomach acid from splashing upwards. Backache is a persistent companion for many women at this stage. Continue to practice excellent posture. When sitting, ensure your lower back is supported. Avoid heavy lifting entirely. A warm bath, a prenatal massage, or the use of a maternity support belt can provide wonderful relief for aching lumbar muscles. Gentle prenatal yoga is also excellent for maintaining flexibility. Pay attention to your dental health. Pregnancy gingivitis can cause your gums to bleed easily due to increased blood flow and hormonal changes. Use a soft-bristled toothbrush and floss gently every day. If your gums are painful or severely swollen, schedule an appointment with your dentist. Maintaining good oral hygiene is crucial for your overall health during pregnancy. Finally, if you are experiencing dry, itchy eyes, use pregnancy-safe lubricating eye drops. Pregnancy hormones can decrease tear production, leaving your eyes feeling gritty. Avoid wearing contact lenses for long periods, and if you work at a computer, remember to blink frequently and take regular screen breaks to rest your eyes.

At 27 weeks, it is time to start tackling the larger practical tasks and preparing for the final stretch of your pregnancy. Actionable Tasks for the Support Person:

• Take over the heavy lifting: Ensure she is resting with her feet up in the evenings. Take over all heavy lifting, carrying groceries, and strenuous household chores to protect her back and reduce her physical strain.
• Monitor hydration: Proactively bring her water throughout the day to help prevent Braxton Hicks contractions and leg cramps. A well-hydrated uterus is a happy uterus.
• Draft a preliminary birth plan: Sit down together and start discussing your preferences for labour and delivery. Do you want a hospital birth or a home birth? What are your thoughts on pain relief? Start drafting a flexible birth plan to discuss with your midwife.
• Look into maternity/paternity leave: Review your respective company policies regarding parental leave. Understand your financial entitlements and start planning the logistics of your time off work.
• Provide physical comfort: Offer gentle lower back massages to ease her aching muscles. Ensure she has a comfortable setup to elevate her swollen feet in the evenings.

While entering the third trimester is an exciting milestone, you must be vigilant for signs of preterm labour or serious complications. Seek Immediate Medical Attention (Go to A&E or contact maternity triage):

• Severe, sudden swelling or headaches: Call your doctor if swelling is sudden and severe in your face or hands, which can indicate pre-eclampsia. This is often accompanied by a severe headache or visual disturbances.
• Regular, painful contractions: Contact your doctor immediately if contractions become painful, regular (more than 4 in an hour), or do not stop when you rest and hydrate. This could indicate preterm labour.
• Fluid leaking from the vagina: A sudden gush or a continuous trickle of clear, watery fluid could mean your waters have broken prematurely. This requires urgent medical attention.
• Reduced foetal movement: If you notice a significant decrease in your baby's normal movement patterns, do not wait until the next day. Contact your maternity unit immediately for a check-up.

Next week, we discuss the crucial importance of tracking foetal movements and how to establish your baby's unique pattern. Make sure to read ahead to our week 28 guide on baby movements, and don't forget to use our free due date calculator to track your exact progression through the third trimester!