Aspirin in pregnancy
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Aileen Keigher
Community Midwife Team Leader Whittington Hospital, London
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Antenatal care

Will my baby be born on their due date?

Your due date is officially 40 weeks after the start of your pregnancy - which, in turn, is officially the first day of your last period before you became pregnant. Only about 2-5% women give birth on their due date.
In Short
Around 80% women give birth between 38-42 weeks.

Around 11% women give birth "prematurely" - i.e. before 37 weeks.

Around 5-10% pregnancies go longer than 42 weeks.

Will my baby be born on their due date?

Doctors and midwives calculate due dates by taking the first day of your last period as day one and the due date as 40 weeks from then. This is most accurate for women with a regular 28-day menstrual cycle as it is based on 14 days to ovulation and fertilisation occurring approximately then. First time mums might be more likely to go overdue.

Statistically speaking, there’s only about a 4-5% chance your baby will be born exactly on their due date. Around 80% of women deliver somewhere between 38-42 weeks. This is called ‘at the term’ so the baby is considered to be fully developed. Around 11% of mums give birth to their baby prematurely i.e. before 37 completed weeks. Sometimes they will spontaneously go into labour and sometimes the decision will be to deliver the baby immediately, either by caesarian or by artificial induction of the birth. In addition, multiple pregnancies tend to come early. Underweight women have a higher chance of delivering early as well.

Births after 42 weeks are called ‘post-term.’ Around 5-10% of pregnancies last longer than 42 weeks, and at that point, hospitals often induce labour, as the rates of stillbirth increase after this time.

Discuss with your midwife, obstetrician or doctor so you are aware of all the options.

Dating scan versus menstrual history

After your dating scan (see our article on scans) your due date may be updated, since it often gives a more accurate reading.

Remedies to induce labour if you’re overdue

Our nutrition expert, Melissa Little, talks through some of the ideas people have about inducing labour.

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This article is for information only and should not be used for the diagnosis or treatment of medical conditions. Essential Parent has used all reasonable care in compiling the information from leading experts and institutions but makes no warranty as to its accuracy. Consult a doctor or other health care professional for diagnosis and treatment of medical conditions. For details click here.