A disturbance in the associative thought process in which one tends to digress readily from one topic under discussion to other topics that arise in the course of associations; observed in bipolar disorder, schizophrenia, and certain types of organic brain disorders. Compare: circumstantiality.
The answer is simple, even if not actually correct. Pregnancies are considered full term at 40 weeks, and many women count four weeks as a month while they are pregnant, making the result a ten month pregnancy. On average there are actually 4.33 weeks in a month, however that a third of a week tends to get lost in the pregnancy shuffle for much of us. Many women also find it easier, when asked how pregnant they are, to answer in weeks instead of months, because pregnancy is generally a count down.
In the U.S., the CDC reports that about 600 women a year give birth in their 50s, and in Germany last year, a 65-year-old grandmother delivered quadruplets. But experts say the odds that IVF treatment will be successful decline steeply once a woman is in her 40s.