Taking multivitamins in early pregnancy may reduce the risk of children developing autism, research suggests.
Experts found that children whose mothers had taken the vitamins were around half as likely to develop autism as those whose mothers took none.
But the team cautioned that although they had found a possible association, more research was needed.
Experts from universities and hospitals in Philadelphia, Stockholm and Bristol, examined data for 273,107 mothers and their children living in Stockholm.
All the children were born between 1996 and 2007, and their mothers’ use of folic acid, iron, and multivitamin supplements were recorded at their first antenatal visit.
Cases of autism spectrum disorder were also identified in national registers.