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Mothers should leave 18 months after giving birth before getting pregnant again, a study suggests. The smaller the interval, the greater the risk of premature births, according to the US research. So how significant is this study? Dr Daghni Rajasingam is a consultant obstetrician and spokesperson for the Royal College of Obstetrics and Gynaecology. (Photo: A doctor makes an ultrasound to a patient at a Paris hospital. Credit: FRED DUFOUR/AFP/Getty Images)