A mother who had the same condition as the Duchess of Cambridge says the illness is debilitating.
Sara Hannak from Belper suffered from hyperemesis gravidarum during her first and second pregnancy.
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It will be a grey start to Monday with patchy rain and drizzle moving in from the south.
Perhaps locally bright at first, but increasing cloud will bring periods of light rain from the south. Winds generally light.
Tonight will stay dry for most. There will be clear spells this evening leading to a chilly night to come.