And if the 40 weeks passes and there's still no baby? Don't panic -- only 5 per cent of babies are born on their scheduled due date. Most doctors wait another two weeks before considering a pregnancy overdue.
Many women go beyond their expected due date. But the number who have what is called a "prolonged pregnancy", a pregnancy that lasts longer than 42 weeks, is thought to be about 4 per cent.
11个月 = 44 weeks
The reason obstetricians worry so much about "post maturity" (going over your dates) is that the very small number of babies who die unexpectedly while they are still inside the uterus (womb) increases after 42 weeks of pregnancy, and increases again after 43 weeks. However, the numbers are still very small.
In the UK, the risk of stillbirth is about 1 per 3000 pregnancies at 39 weeks, 4 per 3000 at 42 weeks and 8 per 3000 at 43 weeks.
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