Women trying for a baby and those in the first three months of pregnancy should not drink any alcohol, updated UK guidelines say.
The Royal College of Obstetricians and Gynaecologists (RCOG) had previously said a couple of glasses of wine a week was acceptable.
However it now says abstinence is the only way to be certain that the baby is not harmed.
There is no proven safe amount that women can drink during pregnancy.
The updated advice now echoes guidelines from the National Institute for Health and Care Excellence (NICE).