Researchers found eating liquorice in pregnancy is linked to a range of developmental issues.
The news is based on Finnish research on almost 400 young adolescents with an average age of 12.5.
Liquorice consumption is thought to be higher in Finland than in the UK thanks to the popularity of salmiakki, a popular salty liquorice snack.
Researchers found girls whose mothers had consumed high amounts of liquorice during pregnancy were more likely to go through puberty at a younger age.
And girls and boys whose mothers consumed high amounts scored seven points lower on intelligence tests, and higher for attention deficit hyperactivity disorder (ADHD).
The component in liquorice thought to cause damage is called glycyrrhizin.