Light drinking during pregnancy is not linked to adverse
behavioural or cognitive outcomes in childhood, suggests a new study published
Authors of the study, from UCL Epidemiology & Public
Health, collated data from the Millennium Cohort Study, a national study of
infants born in the UK between 2000-2002, to assess whether light drinking (up
to two units of alcohol per week) in pregnancy was linked to unfavourable
developmental outcomes in 7-year-old children.
The research is published in in BJOG: An International
Journal of Obstetrics and Gynaecology.
Previous research has linked heavy alcohol consumption
during pregnancy with health and developmental problems in children, however,
the effects of low level consumption remains unclear.
Professor Yvonne Kelly, co-director, ESRC International
Centre for Lifecourse Studies (ICLS) at UCL, and co-author of the study said: “There
appears to be no increased risk of negative impacts of light drinking in
pregnancy on behavioural or cognitive development in 7-year-old children.”
She added: “We need to understand more about how children’s
environments influence their behavioural and intellectual development. While we
have followed these children for the first seven years of their lives, further
research is needed to detect whether any adverse effects of low levels of
alcohol consumption in pregnancy emerge later in childhood.”
Researchers used information on 10,534 7-year-olds from
home-visit interviews and questionnaires completed by parents and teachers to
identify social and emotional behaviour (such as hyperactivity, attention or
conduct problems). The children were also tested for cognitive performance in
maths, reading and spatial skills.
There appears to be no increased risk of negative impacts of light drinking in pregnancy on behavioural or cognitive development in 7-year-old children.
Professor Yvonne Kelly
Groups who made up the sample were mothers who never drank
(12.7%), those who did not drink in pregnancy but otherwise did drink (57.1%),
those who were light drinkers (23.1%) and those who drank more during pregnancy
This study focused on the results from children born to
mothers who were light drinkers and those who abstained from alcohol during
Children born to light drinkers were shown to have more
favourable (lower) behavioural difficulties scores compared with those born to
mothers who didn’t drink during pregnancy. However, the difference was not
enough to be significant, except in the case of boys born to light drinkers who
had slightly fewer reported behavioural problems.
Furthermore, children born to light drinkers were also found
to have more favourable (higher) cognitive test scores compared to children
born to non-drinkers, but these differences mostly lost statistical
significance, except for reading and spatial skills in boys.
The paper concludes that while children born to light
drinkers appeared to have more favourable developmental profiles compared to
those born to mothers who did not drink during pregnancy, after statistical
adjustment these differences largely disappeared.
UCL Epidemiology & Public Health
Research in BJOG: An International
Journal of Obstetrics and Gynaecology (£)