Research by the charity Tommy's and Johnson's Baby has found that 45 per cent of women received conflicting information about their pregnancy, leading to widespread confusion and concern.
One in three respondents said that they were confused by what you can and can't eat during pregnancy, and 15 per cent admitted that they were unsure how much alcohol - if any - they were advised to drink.
Tommy's midwife Sharon Simms commented: "Research is revealing new findings all the time about the best ways for women to keep their babies healthy, so it is vital that mums-to-be get the most up-to-date information from both their midwife and other credible sources."
The expert also said that advice may have changed since family and friends had their children and noted: "What was considered right for our parents' generation may no longer still be the case."
The survey also found that one in four women did not know how much exercise they could safely do while pregnant.