Kate is suffering from Hyperemesis gravidarum, which is a rare and potentially dangerous form of the 'morning sickness' that women often experience in the early months of a pregnancy.
The dangers are dehydration, nutritional deficiencies, and weight loss - sufferers commonly lose 10% of their body weight. A trip to hospital is a normal procedure - the condition can be very dangerous if not treated promptly.
Kate must be feeling dreadful, and my cynicism wasn't directed at her - she seems to be a nice enough person, and your first child is always a big thrill. I just can't bear the way the media go into hyper-drive within hours of these announcements.
The press have "faced all sorts of scurrilous accusations recently" because some newspaper employees have acted illegally. We shouldn't show even a scrap of tolerance towards them for that.
My comment wasn't about all that in any case, it was simply an expression of my personal opinion - the sickly way that some papers deal with stories of Royal engagements/marriages/pregnancies/births turns my stomach, that's all.