I've just looked in 'pregnancy' to see if Chasingcars has updated her thread but the thread isn't there. I found the thread by going through her profile and when I click on it it comes up as though it's in 'pregnancy' but it's not.
Just to confirm, only the last month's worth of posts are in the "front" of the topic. But nothing is ever thrown away and older threads can be found in the other tabs, esp. "Answered".
The pregnancy category does not really get many posts but somewhere like Chatterbank or News would be unmanagebale if we didn't clear things out every now and then.
And, unfortunately, we have to have the same system for ALL the categories.
Also there are only a tiny handful of threads that are still active after one month.