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Light exercise during pregnancy may improve the future health of a child by controlling weight in the womb, New Zealand and US researchers say. Overweight or obese mums are more likely to have larger babies which could be at higher risk of health problems later in life. A study of 84 first-time mothers found exercise was associated with slightly lighter babies. UK guidelines recommend regular light exercise for pregnant women. The rising weight of the UK population over the years has led to a rise in the number of overweight mothers. There is increasing evidence that the future metabolism of a child may be influenced by its environment in the womb, and that babies who are relatively heavy for their length may be more likely to be obese in future years. Official guidance in the UK tells doctors to encourage women not to overeat during pregnancy, and to, wherever possible, take light exercise on a regular basis.