Pregnancy week 40: the due date — and the truth about it

An estimate, not an appointment

Here it is — the date circled since the first scan. And the first truth of week forty: it was always an estimate. Around one baby in twenty arrives on the due date itself; the majority come in the week before or the week after. Forty weeks plus days is not 'late' — it's the normal tail of a normal distribution.

The system's answer to the uncertainty is monitoring, and this week it steps up: counts daily as ever, and per your hospital's protocol likely an NST (a heartbeat-pattern recording, done lying comfortably with a belt on the bump) and a fluid check. All of it answers one question — is the baby still comfortable in there? As long as yes, waiting is the right plan.

If the days pass, the induction conversation arrives on schedule (usually somewhere in week forty-one, earlier on indications like BP, fluid or growth). It's routine care with proper reasons, discussed with you, not sprung on you. And on the other side of whichever door — labour ward or planned date — the same thing waits: the baby, and the first weeks. That road continues on our baby's week-by-week pages.

Your baby this week

The baby is fifty-plus centimetres, three to three and a half kilos (the healthy range is wide), running daily quality checks on its own systems and gaining still.

Nothing is 'finishing' anymore — everything is done. The vernix is down to the creases; the nails may need trimming at birth; some babies arrive with a full head of hair and some gloriously bald, and both were decided months ago.

The movements remain your daily telegram to the very end. A term-plus baby is a strong, present baby — the count holds its full authority on the due date and after it.

Changes in your body

Everything may ache mildly and nothing may be happening — the classic week-forty state. Or the cervix may be quietly at three centimetres. Both roads reach the same room.

A 'membrane sweep' may be offered at a visit now — the doctor separates the membranes from the cervix with a gloved finger, which can nudge labour within days. It's uncomfortable for a minute, optional always, and worth asking about rather than being surprised by.

The mind's job this week is patience under commentary — every phone call opens with 'no baby yet?'. The drafted auto-reply earns its keep; the daily walk clears the head; and the monitoring visits are where the real information lives, not in the aunty-network's theories.

What to do this week

Keep the stepped-up monitoring appointments exactly — count daily, NST/fluid checks as scheduled. 'Still comfortable' is the green light that makes waiting the right plan.

Have the induction conversation whenever your doctor raises it (or at forty-one weeks by default): the why, the method they'd use, the timeline, and what changes the plan. Write the agreed date down; babies love overruling written dates.

Keep the household at ready-idle: bag by the door, phone loud, escorts warm, no distance travel. The drill needs no more rehearsal — just availability.

Bookmark the road ahead: the baby's first three months, week by week, are mapped on our newborn pages — feeding, sleep, the first fevers, your own recovery. The day the bump becomes a baby, that's the series that takes over from this one.

Week 40 at a glance

The week's essentials in one place. Your doctor may adjust these for your situation.

When to see a doctor at once

To the very end, unchanged — go now: waters, bright-red bleeding, five-minute pains, severe headache with vision changes, failed or slumped count. Call first: organised tens, slow counts, fever, burning, reduced clarity of the baby's pattern, any unease. Post-date, the phone's threshold drops again: when in doubt, call — that is the entire protocol.

And the last word of the series is the first rule of the next one: once the baby arrives, fever in a baby under three months old means hospital the same day — no home remedies, no waiting. Carry that one sentence from this series into the newborn weeks; it is the most important sentence we know.

This article is general information only and no substitute for personal medical advice. The person who can advise you knowing your health, your medicines and your previous pregnancies is your obstetrician, or the doctor at your nearest health centre.

Work out your due date

Enter the first day of your last period and your cycle length — your estimated due date, this week's count and the anomaly scan window all appear right here.

It is only an estimate — most babies aren't born on the exact date. A first-trimester scan dates a pregnancy more accurately; in the end, your doctor's date is the one that counts.

Frequently asked questions

Q: The due date passed — is my baby 'overdue'? — Not yet, medically: 'post-term' starts at forty-two weeks, and forty-one-and-change with clean monitoring is the normal tail. What matters this week isn't the calendar but the checks — comfortable baby, waiting plan; any flag, the plan updates. You are exactly where the system expects you.

Q: Does induction mean the labour will be worse? — Induced labour can start more abruptly (the slow warm-up gets compressed), and pain-relief plans are worth discussing upfront. But 'worse' isn't the rule — plenty of induced labours run textbook. The method (gel, balloon, drip — your doctor will explain theirs) matters less than the monitoring around it, which is continuous.

Q: What if I go into labour the night before the planned induction? — Then the baby chose, as babies do — go in as labour, mention the booking, carry on. The plan was scaffolding; the baby is the building.

Q: Nine months of these pages — what's the one-line summary? — Trust the pattern, phone early, and let the checklist carry what memory can't: counts daily, warning list sacred, papers in the pouch, bag by the door. Everything else — the size-of-a-mango weeks, the first kick, the name list — was the story. Go have the baby; the newborn pages are waiting.