The brain continues its final maturation — myelination is still underway, the neural connections still multiplying. The lungs continue their alveolar development. The fat continues to accumulate — 2.85kg now. The baby at 37 weeks is fully formed, physiologically complete in every system that matters, and ready for birth.
Meconium in the amniotic fluid during labour (meconium-stained liquor) is monitored carefully by the birth team, as it can sometimes indicate foetal distress. The presence of meconium in the waters is one of the reasons continuous monitoring may be recommended if it occurs. See the Labour & Birth guide for how this is managed if it arises. In the postnatal period, the transition from meconium to the yellow, seedy stools of breastfed babies happens over the first three to five days. Understanding this in advance means the appearance of the first nappy will not alarm you. See the Newborn Essentials guide for what to expect in the first days.
While 37 weeks is full term, every additional day in the womb continues to add genuine benefit — particularly to brain development and immune function. The difference between a baby born at 37 weeks and one born at 40 weeks is measurable, if modest. There is no need to wish the baby out early; there is genuine developmental benefit to allowing labour to begin spontaneously.
The baby at 37 weeks is in a position that is unlikely to change significantly. Most are firmly head-down, engaged in the pelvis. The vertex position — head down, chin tucked, back toward the front — is optimal for birth. Posterior position (back to your back) is common and can make labour longer; it often corrects spontaneously during labour. Your midwife will note position at the 38-week appointment.
When I woke up on the morning I turned thirty-seven weeks I felt something I hadn't expected: relief. Pure, simple relief. Not because anything had changed clinically — the birth was still weeks away — but because I'd carried us here. Both of us had made it. Whatever happened next, the hardest part of keeping them safe was done. They could come now and be fine. I sat with my tea and thought: we did it. And then I cried, quite happily, for about ten minutes.
From 37 weeks, the body's primary task for the person carrying the pregnancy is preparation for labour — not further preparation for pregnancy. The cervix is ripening, softening, and beginning to dilate slowly. The hormonal environment is shifting toward the complex orchestration of parturition. Every major system is orienting toward the birth. The most useful thing you can do is rest.
From 37 weeks: stay close to home. Reduce commitments. Accept help with everything that can be helped with. Sleep when you can, for as long as you can. The preparation is done. The work that remains is rest.
Waters breaking: contact your maternity unit immediately. They will advise on timing. If the fluid is green or dark, this may indicate meconium — tell them this immediately.
Contractions becoming regular: time them. Early labour contractions are often 10–15 minutes apart and irregular, lasting 30–45 seconds. Active labour contractions are 5 minutes apart or less, lasting 60+ seconds, and intensifying. A first-time labour often involves several hours of early labour before the active phase begins. See the Labour & Birth guide for the full early labour section.
Strong intuition that labour has begun: trust it. Call your midwife.
Full term has its own distinct emotional quality — relief, mostly, and a new kind of readiness that wasn't available before. The anxiety of the preceding weeks, which was partly about whether the pregnancy would continue safely, has a different character now. The baby is here and full term and everything that needed to be done has been done. What remains is waiting, and waiting with something approaching equanimity is the task of weeks 37 to 40.
The waiting is harder than it sounds. The physical discomfort of full-term pregnancy is real and sustained. The uncertainty about when labour will start — this week? next week? after the due date? — is genuinely uncomfortable to live inside. Many people describe the weeks between 37 and 40 as the most psychologically demanding of the entire pregnancy: physically maxed out, emotionally ready, but with no reliable indication of when it will end.
Nobody told me how hard the waiting would be. By thirty-seven weeks I was as ready as I was going to be — bag packed, preferences printed, number saved, nothing left to do. And then I just had to... wait. For potentially three more weeks. The not-knowing was extraordinary. Every twinge felt significant. Every day without labour felt like information. I made an active decision to stop treating every sensation as a possible labour sign and just rest. It was the best decision of the final weeks.
Niamh's decision — to stop treating every sensation as a possible labour sign and simply rest — is exactly the right one. Early labour will announce itself clearly enough. The preceding days and hours do not need to be spent in anxious analysis of every pelvic twinge. The Emotional Wellbeing in Pregnancy guide has practical strategies for managing the particular anxiety of the waiting period.
Everything before has been preparation. These are the guides for what comes next.
Full term means the birth can happen at any point from today. That is not a reason to panic — most first labours begin spontaneously between 38 and 41 weeks. But it is a reason to be practically ready from this moment forward: phone charged, close to home where possible, nothing scheduled that can't be left at short notice.
The most useful thing you can do in the weeks between now and the birth is precisely what Niamh describes: create an environment in which your partner can rest without guilt. Cook, keep the house running, reduce noise and stress, and don't require anything of them that isn't essential. The rest they are getting now is preparation for labour. Your job is to make that rest possible.
- Your phone must be charged and on, always. From 37 weeks, labour can begin without notice. If your partner cannot reach you, all the preparation in the world is undermined. Be reachable.
- Know the drive to the hospital, in the dark, under stress. Know where to park. Know which entrance to use at 3am. Know the phone number for the maternity unit. Have it saved under "Maternity Triage" so you find it in a hurry.
- Have read the Labour & Birth guide's partner section by now. What you do during contractions. How to support during pushing. What to say and not say. The guide covers partner's role in specific, practical detail — not "be supportive" but exactly how.
- Acknowledge the milestone. Full term is an extraordinary thing. Both of you carried this pregnancy to this point. That deserves to be said.
Rest. Genuinely, deliberately, completely rest. Not "rest when you can find time between finishing things." The preparation is done. The things that remain undone are either not important or can be done after the baby arrives. From this week, resting is the most productive thing you can do for the birth ahead.
The 38-week appointment is next week. Membrane sweeps are often first offered here. Come with this question ready:
A membrane sweep involves the midwife sweeping a finger around the cervix to separate the membranes from the uterine wall, releasing prostaglandins that may encourage labour to begin. It is offered as an alternative to induction and has a moderate evidence base — it increases the chance of labour beginning within 48 hours for people whose cervix is already softening. It can be uncomfortable. It does not guarantee labour onset. Understanding what it is before it is offered allows you to make an informed choice rather than agreeing or declining under mild pressure. The Scans, Tests & Antenatal Care guide covers membrane sweeps and the induction pathway in full.