The Third Trimester: Preparing for Birth from Week 28

Physical Changes from Week 28

By week 28, your baby weighs roughly 1 kg and your uterus has expanded well above the navel — by 40 weeks, it sits just below the ribcage, displacing virtually every adjacent organ. That displacement is what drives most third-trimester discomforts: the diaphragm gets compressed (breathlessness), the bladder gets squeezed (trips to the bathroom every hour at night), the stomach empties more slowly (heartburn after even small meals), and the pelvis absorbs increasing load — pelvic girdle pain affects around 1 in 5 pregnant women, according to the Royal College of Obstetricians and Gynaecologists (RCOG).

Sleep in the third trimester is genuinely difficult, and not because you're doing anything wrong. Restless legs syndrome peaks during pregnancy (affecting up to 26% of pregnant women, per a 2015 review in Sleep Medicine Reviews), physical discomfort makes finding a comfortable position a nightly project, and nocturia interrupts whatever sleep you do get. Sleeping on your side with a pillow wedged between your knees and another supporting your bump offloads pelvic pressure significantly. Fragmented sleep is the norm at this stage — working with it by resting in the day rather than fighting for unbroken nights is a more effective strategy.

Mild ankle and foot swelling by the end of the day is benign and extremely common. What requires same-day medical assessment is a different picture entirely: swelling in your face or hands, a persistent headache that won't respond to paracetamol, blurred or flashing vision, or pain in your upper right abdomen — these can be signs of pre-eclampsia, which the NHS estimates affects 6% of pregnancies and requires prompt monitoring.

Birth Preparation: What Actually Helps

A Cochrane review of childbirth education programmes (Gagnon & Sandall, 2007, updated 2015) found that women who attended structured antenatal education reported greater knowledge of pain management options and felt more in control during labour. The format matters less than the engagement: hospital classes, independent hypnobirthing courses, and one-to-one midwife sessions all produce better-informed mothers than no preparation at all. The goal is not a perfect birth plan but a clear understanding of what choices exist and who to call when something changes.

• Attend a birth preparation class (hospital-based, independent, or hypnobirthing — all have value)
• Write a birth plan: not as a rigid script but as a way to clarify your preferences and communicate them to your care team
• Understand all pain relief options available at your planned birth setting
• Pack your hospital bag by week 36 (term labour can begin from 37 weeks)
• Know the signs of labour and when to contact your maternity unit
• Have a plan for getting to the hospital, including backup arrangements

Emotional Preparation for Birth

Around 14% of pregnant women experience clinically significant anxiety, according to a 2017 meta-analysis published in BJOG. Fear of childbirth — tokophobia in its clinical form — sits on a spectrum from normal apprehension to anxiety severe enough to affect daily functioning. If you are dreading birth rather than just feeling nervous about it, raise this at your next midwife appointment before 32 weeks: specialist birth debrief services, additional consultant-led appointments, hypnobirthing, and in some NHS trusts access to perinatal mental health teams are all available options. Waiting and hoping the fear fades is the least effective approach; addressing it directly gives you more time to put a plan in place. A well-supported, informed mother has measurably better labour experiences — preparation is clinical, not just comfort-seeking.

Late-Pregnancy Appointments: Weeks 28–40

Third-trimester antenatal appointments become more frequent as you approach your due date — typically every 2–4 weeks from week 28, then weekly from week 36. At each visit your midwife or doctor checks blood pressure and urine (pre-eclampsia screening), measures fundal height, and confirms the baby's position from around week 36. Growth scans are offered if indicated: gestational diabetes, small- or large-for-dates measurements, twins, or reduced movements all warrant additional ultrasounds. If you are offered a scan, attend — late-onset growth restriction is one of the conditions most effectively caught by late-pregnancy monitoring.

From 35–37 weeks, Group B Strep (GBS) screening may come up. GBS is carried harmlessly by 20–30% of adults but can occasionally cause serious neonatal illness if passed to the baby at birth. The NHS uses a risk-factor protocol rather than universal screening; in the US and Australia a vaginal/rectal swab at 35–37 weeks is standard. If you are uncertain of your unit's policy, ask at your 34-week appointment. Women who test positive, or who have other GBS risk factors, are offered intravenous antibiotics during labour.

Frequently Asked Questions