Only 4% of babies arrive on their due date. Here's what to know about membrane sweeps, induction, the home remedies people suggest, and looking after yourself through the wait.
Your estimated due date (EDD) is calculated as 40 weeks from the first day of your last period, based on an average gestation. But only around 4% of babies are born on their due date. Most are born in a window of two weeks either side. Your due date is not a deadline — it's an approximation.
The term 'going overdue' typically applies from 41 weeks. 'Post-term' applies from 42 weeks. Most hospitals offer induction between 41 and 42 weeks — the timing varies slightly by trust. Arriving at 40+1 without being in labour is not a complication. It is, statistically, completely normal.
From around 40–41 weeks, your midwife will offer a membrane sweep (also called a stretch and sweep). This is an internal examination where the midwife inserts a gloved finger into the cervix and sweeps it around to separate the membranes from the cervix, stimulating prostaglandin release which may trigger labour.
A sweep is not induction — it works with your body's own hormones rather than introducing synthetic ones. Around 50% of women who have a sweep go into labour within 48 hours. The other 50% don't, and this is still considered a normal outcome. It can cause discomfort and some spotting afterwards, which is normal. You can decline it if you wish; it is offered, not mandatory.
If you reach 41–42 weeks without going into labour, you'll be offered induction. Induction starts or speeds up labour using medical means — typically prostaglandin pessaries, breaking the waters (amniotomy), or a hormone drip (syntocinon), or a combination.
Induction changes the experience of labour — contractions often come more quickly and intensely than spontaneous labour, and epidural rates are higher among induced women. It also meaningfully reduces the risk of stillbirth at post-term gestation, which is a real if small increase in risk.
You have the right to accept, delay, or decline induction. If you want to decline or postpone, you're entitled to discuss the evidence — specifically the risk data at your particular gestational age — and to have that discussion without pressure. Increased monitoring (cardiotocography and growth scans) is typically offered as an alternative while you decide.
Every overdue woman receives the same list of suggestions. The honest evidence:
Sex: semen contains prostaglandins which theoretically soften the cervix. Evidence of effectiveness is weak but it carries no risk if you're comfortable with it.
Nipple stimulation: stimulates oxytocin release. Probably the home method with the most plausible mechanism. Some evidence it works; should only be done if you're 40+ weeks and close to your hospital.
Walking and exercise: no evidence it starts labour, but reasonable for general wellbeing.
Spicy food, pineapple, raspberry leaf tea: no meaningful evidence for any of these.
Castor oil: causes diarrhoea and uterine cramping; not recommended. It doesn't reliably induce labour and causes significant discomfort and dehydration.
The honest answer: nothing reliable outside medical induction. But doing things that help you feel active and in control of the situation has real wellbeing value even if they don't start labour.
The final weeks of an overdue pregnancy are psychologically difficult in a way that isn't always acknowledged. The combination of physical discomfort, frustrated anticipation, well-meaning but intrusive questions from everyone you know, and the loop of wondering if today is the day — all of this is genuinely hard.
A few things that help: telling people not to message you, rather than managing their expectations individually. Having a plan for each day that has nothing to do with labour. Being honest with your midwife if anxiety is high — they can offer additional monitoring appointments that provide reassurance. And knowing that this ends. Every overdue pregnancy eventually results in a baby. Yours will too.