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But Eleanor also had good news And amazingly, both had been given the same predicted delivery date - 4 April. So what are the chances of both giving birth on the same day?
In the UK, where Chaney and Marshall live, a woman's estimated date of delivery is first calculated by using the date of her last period and adding days, or 40 weeks. That is followed by an ultrasound scan where another estimate is made, based on the size of the foetus. If the two "due dates" differ by a week or more, the scan is taken as the more accurate measure.
It's the same in most developed countries. The figure is higher when premature births and pregnancies with complications are not included, but only marginally 4.
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While it may be helpful for accuarcy to get an idea of when their child will arrive, the main purpose of the due date is to "define a metric for the care" of the mother during pregnancy, says Prof Jason Gardosi of the Perinatal Institute. What, then, are the chances of Penelope's and Eleanor's babies both being born on 4 April?
Only 4. That's a probability of one in The chance that their children will be born on the same day - any day, not necessarily 4 April - is higher.
It's about one in Gardosi says the statistics reveal an important message for pregnant women. The phrase "due date" is misleading. That makes it sound too accurate, he says - it should really be called an "estimated date". Related Topics.]