MUMS-to-be who binge drink risk making it less likely that their child will pass school exams, say University of Nottingham researchers.
Women who drink large amounts of booze in one go also increase the risk of their child having mental health problems.
The findings, revealed today, say these problems can include hyperactivity and a short attention span.
Professor Kapil Sayal, of the university, was the main author of the report.
He said: "Women who are pregnant or who are planning to become pregnant should be aware of the possible risks associated with episodes of heavier drinking during pregnancy, even if this only occurs on an occasional basis.
"The consumption of four or more drinks in a day may increase the risk for hyperactivity and inattention problems and lower academic attainment – even if daily average levels of alcohol consumption during pregnancy are low."
The research examined data from more than 4,000 children and their mums. It builds on earlier research on the same children that found a link between binge drinking in pregnancy and their mental health when aged four and seven, suggesting that problems can persist.
Other effects, such as on academic performance, may only become apparent later in a child's life.
The women were asked about their drinking pattern at both 18 and 32 weeks of pregnancy and again when their children were aged five. Mr Sayal added: "The study's findings highlight the need for clear policy messages about patterns of alcohol consumption during pregnancy."
The information was collected from the Children Of The 90s study, in which academics in Bristol charted thousands of families.
The Nottingham academics went back to some of those involved in that study to see the impact that binge drinking in pregnancy had.
Councillor Alex Norris, portfolio holder for health at Nottingham City Council, said: "We know that drinking during pregnancy can cause serious health issues for your unborn baby, and this study adds to a growing evidence base that problems can continue later into the child's development. The public health advice is very simple – there is no safe limit for drinking in pregnancy."
Sally Johnson, 36, a mum-of-two in Valley Road, Basford, said she cut out drinking when she became pregnant. She added: "Research like this is useful as it shows mums that they should not drink lots when pregnant.
"I used to binge drink a bit but I knew there may be risks so I stopped. Others should feel they can do the same."
