Ultrasound scans can be used to estimate fetal size and help predict the due date, but they are not always accurate.Factors that can affect the length of pregnancy include maternal age, health conditions, and whether the baby is a first child.On the other hand, post-term pregnancies carry a slightly increased risk of complications such as fetal distress and stillbirth.About 10% of pregnancies end in preterm birth, which can carry an increased risk of health problems for the baby.Babies born before 37 weeks are considered preterm, while those born after 42 weeks are considered post-term.Most pregnancies last between 37 and 42 weeks.Here are some additional facts that you may find interesting: In fact, only about 5% of babies are born on their due date, according to medical research. It is also important to note that the due date is just an estimate and is not a guarantee that the baby will be born on that day. This is because the length of pregnancy can vary from woman to woman, and even from one pregnancy to the next. However, it is important to keep in mind that the birth of a child can occur within a few days plus or minus two weeks from the due date. While the due date calculation is an estimate, it can help mothers to prepare for the arrival of their baby. It works by adding 40 weeks, or 280 days, to the first day of the last menstrual period. The calculator uses the date of the mother's last menstrual period to estimate the due date.
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