A study has found just two cups of coffee a day while pregnant can make unborn babies more likely to be overweight.
A Norwegian study of 51,000 mothers and children concluded children exposed to more than 200 mg of caffeine per day were more likely to be overweight by the age of three.
The findings of the observational study, published in journal BMJ Open, challenges current recommendations to only limit caffeine intake while pregnant.
While they can't prove cause and effect, the researchers suggest pregnant women should cut out caffeine altogether.
Caffeine passes rapidly through tissues, including the placenta, and takes the body longer to get rid of during pregnancy.
Previous research has linked caffeine intake to a heightened risk of miscarriage and restricted foetal growth.