The findings come from a meta-analysis of 31 trials, which included more than 32,000 women and their babies.
It showed that the risks of developing pre-eclampsia, delivering before 34 weeks or having a pregnancy with a severe adverse outcome were reduced by 10 per cent in women taking aspirin or other antiplatelet drugs.
Women taking aspirin during pregnancy took a low dose, using 75mg or 150mg daily.
Aspirin had no significant effect on the risk of death of the foetus or infant, baby birth weight or bleeding events in mother or baby, said the researchers.
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