The eyes that opened last week are now opening and closing regularly in response to light changes, and the sleep cycles that have been developing alongside them this week reach a new level of organisation: your baby is now experiencing REM sleep. Rapid Eye Movement sleep — the phase associated with dreaming in humans — is now a regular part of your baby's rest cycle, weeks before birth.
What does a baby in the womb dream about? No one knows with certainty. The content of dreams depends on the content of waking experience — and the waking experience of a 27-week foetus is the rhythm of your heartbeat, the sound of your voice and digestion, the flavours of the amniotic fluid, the filtered warmth of light through tissue, and the sensation of floating movement. Whatever is being processed in those REM cycles, it is a brain doing the most fundamental work of being alive: making sense of experience. They are dreaming. Inside you. Weeks before they arrive.
The sleep-wake cycle is now well established and increasingly readable. Most babies at this stage are active for periods of 20–40 minutes and quiet for comparable periods, with predictable busy times — often in the evenings when their carrier is still, and the motion that can lull them to sleep during the day has stopped. The rhythms you have been noting in the diary are their rhythms, already individual, already theirs.
The baby has reached 238mm and 875g — approaching one kilogram, which will be crossed next week. Weight gain is approximately 100g per week from now, accelerating as the third trimester's intensive fat deposition begins. The brain, the fat, the lungs, the bones — all are in the final phase of preparation for the outside world.
I read about the REM sleep at twenty-seven weeks and sat with it for a long time. This impossible idea: that something is happening inside me, right now, that I cannot see or influence or know. A private interior life, already begun. It made the pregnancy feel less like something happening to me and more like something happening alongside me — a companion already doing their own work.
The physical experience of week 27 continues the intensifying pattern of the late second trimester. The uterus is now substantial — the fundal height is approximately 27cm — and its upward pressure on the diaphragm, stomach, and surrounding organs is significant. Rest has become genuinely important, not as an indulgence but as a physiological necessity: the body is doing extraordinary work, and it needs recovery time.
From this week forward, rest is not optional. The third trimester's physical demands — which begin next week — are real, and starting them from a position of rest rather than depletion is meaningfully better. If work arrangements allow any flexibility, now is the time to begin reducing the intensity. If you are on your feet all day, ask your employer about a risk assessment and reasonable adjustments — you are entitled to this from disclosure.
Week 27 carries the specific emotional weight of a threshold. The second trimester — the golden period — ends here. Everything that has characterised these fourteen weeks: the relative comfort, the settled quality, the daily movements as company, the milestones passed and absorbed — all of this is giving way to something different. The third trimester is not frightening, but it is demanding, and it is closer than the second trimester made it feel.
The dreaming detail this week tends to land with particular force. The idea of an interior life already underway — something private and inner and already processing, already dreaming, already its own — is one of the most profound things that pregnancy offers. It cannot be confirmed, observed, or shared. It can only be known intellectually and felt through whatever combination of wonder and love that produces in each person who thinks about it.
Week twenty-seven was when I stopped calling the baby 'it' even in my head. I don't know if it was the dreaming, or the eyes, or just the accumulated weeks of knowing their rhythms — but something settled into a kind of certainty. There was a person here. A person who dreamed. Who had preferences and patterns and a private life I couldn't see. That felt enormous.
There is also, for many people, a growing urgency in week 27 — the sense that the remaining time is both sufficient and suddenly finite. Twelve weeks to the due date. The preparations that seemed distant at week 20 are now immediate. The third trimester will bring its own preoccupations; the relative mental clarity of the second trimester's final weeks is genuinely useful for getting the thinking done. Use it.
The third trimester begins next week. These are the guides most relevant to where you're going.
The second trimester ends this week. What comes next — the third trimester's twelve weeks — is the final preparation window, the most physically demanding stretch, and the period that ends with the birth. The pace is about to change. The demands are about to increase. And the two of you are about to enter the final chapter of this particular journey.
The dreaming detail this week tends to affect partners differently to the person carrying the pregnancy — there is something in the thought of an already-active inner life, of a person already doing their own private work inside, that can shift a partner's relationship to the pregnancy in a final, significant way. If you haven't yet talked to the bump, talked about the baby by name (if you have one), or allowed yourself to fully inhabit the reality of who is coming — this week is a good time for that shift.
- Acknowledge the threshold together. The second trimester ends here. Something worth naming — a conversation, a meal, a moment of joint recognition that fourteen weeks of remarkable development have passed and something new is about to begin.
- The 28-week appointment is next week. Attend if at all possible — it includes blood results, birth preference review, and the whooping cough vaccine. Being present for the blood results conversation, in particular, is worthwhile.
- Prepare for the physical demands of the third trimester. Your partner's body is about to become significantly more demanding to live in. The sleep disruption, the physical discomforts, the reduced mobility of the final weeks — understanding that these are coming, and having thought about how you will support them, is more useful than being surprised by them.
Write your birth preferences — and share them. Not a wish list, and not a rigid plan: a clear, considered document of your preferences, written while you are in a position of relative calm and clarity, that can be shared with your birth partner and your midwife in advance of birth. If you began this at week 26, complete it this week. If you haven't started, start now — there is still time, but the third trimester's additional demands make it harder to think clearly.
Environment preferences — lighting, music, who is present, how you want clinical information communicated during active labour.
Pain relief — your preferences, in order, with openness to change acknowledged.
Third stage, cord clamping, skin-to-skin — specific preferences written down explicitly.
Feeding intention — so postnatal care is set up to support you from the start.
If a caesarean is necessary — your preferences even in that scenario. A caesarean birth can still reflect your values if your preferences are known.
Who to call — your birth partner's number, any other key contacts, and what happens if you go into labour before your partner can reach you.
Arrive at the 28-week appointment with your birth preferences outline and ask:
This conversation serves two purposes. It ensures your preferences are clinically informed — that nothing you have written is incompatible with your individual risk profile or your local unit's capabilities. And it creates a relationship between you and your midwife team around your birth that is active and collaborative rather than passive. Midwives who know what you want are significantly better placed to advocate for you in the birth room.