Your baby is now 160mm — a banana — and has reached 300g. At the halfway point, it is worth pausing to take stock of what has been built: a brain producing 100 neurons per minute, a beating heart completing its 100-millionth beat, fingerprints, a skeleton, working kidneys, sealed eyes that respond to light, ears that can hear your voice, taste buds already encountering the world through amniotic fluid, and a body covered in the protective coating of vernix and the soft insulation of lanugo.
The movements that started as flutters are now a more consistent presence. The baby is active for periods and quiet for periods — a sleep-wake cycle is already established. During active periods, a hand placed on the abdomen at the right moment may begin to detect movement from the outside. Partners who have not yet felt anything may begin to do so in the coming weeks.
The baby's skin, while covered in vernix, is still quite thin and somewhat translucent — the blood vessels beneath are visible. Subcutaneous fat, the layer that will give newborns their characteristic roundness, is just beginning to accumulate. This process will accelerate significantly in the third trimester, particularly in the final four weeks before birth.
I marked twenty weeks by taking a photograph in the mirror. Not a professional bump photo — just me, in our bathroom, at exactly halfway. I kept it. Years later I look at that photograph and think: that person had no idea what was coming, and had already done so much. It still makes me cry.
At week 20 the fundal height — the distance from the pubic bone to the top of the uterus — is approximately 20cm, which happens to correspond neatly to the week of pregnancy. From here on, midwives will measure this at each appointment as a simple, reliable indicator of foetal growth. A fundal height that differs significantly from the gestational week (more than 2–3cm in either direction) prompts further investigation, though most discrepancies have benign explanations.
The physical experience of week 20 continues the positive trajectory of recent weeks for most people. Heartburn and the sleeping position adjustments described last week are ongoing, as is round ligament pain for many. The bump is unmistakably present. Energy is good. The movements are becoming a reliable daily presence.
Belly button changes — the navel, which may have already begun to flatten, sometimes begins to pop outward (protrude) around now as the uterus grows. It returns to its normal position after birth. Some people find the sensation of a protruding belly button uncomfortable — wearing a soft belly band or pad over it helps.
Skin stretching — the abdomen may feel tight and occasionally itchy as it stretches. Moisturising regularly helps with comfort, though its effect on stretch marks (which are largely genetic in their occurrence) is less certain.
If you haven't had the anomaly scan yet, it should be imminent — the window closes at 20 weeks and 6 days in most NHS trusts. If yours has happened and produced a result that requires follow-up, your maternity team should have been in contact. If you are waiting for results or a further appointment, contact your midwife if you haven't heard within two weeks of the scan.
Halfway deserves its own emotional acknowledgement. Not just as a statistic — twenty of forty — but as a genuine reckoning with what has been done. The first half of pregnancy contains all the uncertainty, all the invisible effort, all the anxiety managed without adequate external evidence. The second half is, statistically and experientially, more predictable. Getting to the halfway point means you have navigated the part of pregnancy that requires the most from you in exchange for the least visible return.
For many people, week 20 is one of the most genuinely joyful weeks of the whole pregnancy — the combination of a good anomaly scan result, the halfway milestone, and the daily physical presence of the baby's movements creates a sense of earned confidence. Not certainty — pregnancy never offers that — but a quality of trust in the process that the first trimester almost never allows.
Twenty weeks was the week I stopped holding my breath. Not completely — but I noticed that I'd started making plans. Future tense. Assuming they'd be here. I'd been afraid to do that, all the way from the positive test. Twenty weeks was when I allowed myself to believe it was real.
The horizon of the second half of pregnancy is also coming into view — not as a source of anxiety, but as a landscape worth understanding. The third trimester, birth preparation, the newborn period: these feel real enough now to begin engaging with thoughtfully, without the urgent pressure of the first trimester's survival mode or the uncertainty before the anomaly scan.
If you have had a difficult result from the anomaly scan, or if you are managing ongoing anxiety about the pregnancy, this week may feel very different from the above. Please speak to your midwife or GP — you are entitled to support, and seeking it is not weakness. The Tommy's Pregnancy Line (0800 0147 800) and ARC (antenatal results and choices, arc-uk.org) both provide sensitive, specialist support.
The second half of pregnancy opens new ground — these guides are most relevant to where you're headed next.
The halfway point belongs to both of you. The months of adapting, supporting, covering, and showing up — while your partner carried something that was invisible and then increasingly visible — represent a genuine shared investment. Week 20 is a milestone for the pregnancy, and it is also a milestone for the two of you together. Name it. Mark it somehow — a meal, an evening, an acknowledgement that is specific rather than generic.
The second half of pregnancy is where partner involvement tends to deepen in new ways. The movements, which were felt by one person until now, may begin to be felt by two. The birth is close enough to be a real conversation. The baby is real enough to begin imagining in full. The second half offers engagement that the first half, with its invisibility and anxiety, couldn't quite provide.
- Try to feel the movements. The baby may now be strong enough for a partner's hand on the bump to occasionally detect movement. Ask to try, be patient, and don't be disappointed if it takes more weeks — it is coming.
- Begin engaging with birth preparation. Antenatal classes (if not already booked, book now), your own reading, understanding the options. Being genuinely informed about birth — not just present at classes — is one of the most useful things a partner can do from this point.
- Think about the fourth trimester. The first 12 weeks after birth are covered in depth in the WiseMama app and topics. Beginning to understand what the postnatal period actually involves — the sleep, the feeding, the recovery, the emotional adjustment — means you will not be blindsided by it.
Mark the halfway point deliberately. Not a grand gesture — simply an intentional acknowledgement of what has been done. This week is worth celebrating in some form: a photo, a journal entry, a meal, a conversation with your partner about where you both are. The first half of pregnancy is demanding and underacknowledged. You reached it. That is worth something.
Practically, this is also the right week to take stock of where you are with preparation for the second half:
Birth preferences — begun thinking about them? Have you discussed birth options with your midwife?
Maternity / paternity leave — formally notified your employer? Understood your entitlements?
Anomaly scan — complete and results received? If you're still waiting for follow-up, contact your midwife team.
Movement awareness — are you beginning to know your baby's patterns? The Tommy's movement guidance is worth reading now, before it becomes relevant in the third trimester.
Support network — do the people around you know what you need? Have you talked about the postnatal period — who will help, how?
Baby name — halfway is a natural time to begin. The WiseMama Baby Name Finder has thousands of names with meanings, origins, and popularity data to browse together.
At your next appointment — and from this point forward — one question is worth asking every time you are seen:
This question serves two purposes: it ensures you leave every appointment with a clear understanding of your current status, and it creates space for your midwife to share anything that merited mention but wasn't quite a formal concern. From week 20 onwards, appointments will become more frequent and each one adds to a growing picture of how your specific pregnancy is progressing. Being an active, informed participant in each of those appointments — rather than a passive recipient of reassurance — produces better outcomes and a more confident experience.