Women who drink even a little bit of alcohol during pregnancy may be more likely to have babies with slight facial abnormalities that have been linked to developmental problems, a recent study suggests.
When researchers examined data from facial images for 415 one-year-old children, they found subtle changes in babies’ faces mostly around the nose, eyes and lips associated with almost all levels of alcohol exposure regardless of whether drinking occurred only in the first trimester or throughout the pregnancy.
“We are surprised to see these differences in facial shape with low doses of alcohol exposure, which in our study was defined as two standard drinks on any one occasion and no more than seven in a week,” said lead study author from the Murdoch Children’s Research Institute and the University of Melbourne in Australia, Evelyne Muggli.
Children exposed to alcohol in the womb may have learning challenges such as deficits in memory or speech as well as behavior problems like hyperactivity.
“This means that any level of alcohol contributes to the way the face is formed and raises questions about the possible impact on brain development, which is the subject of further research,” Muggli said.
The facial changes found in the study are so subtle they are not visible to the naked eye, Muggli said. They can only be seen with sophisticated three-dimensional facial shape analysis, and they do not necessarily mean that unborn babies have been harmed if mothers consumed some alcohol while pregnant, Muggli added.
But differences around the middle of the face and nose seen with alcohol exposure during pregnancy in the study resemble anomalies associated with fetal alcohol spectrum disorder, researchers reported in JAMA Pediatrics.
Differences were most pronounced between children with no exposure to alcohol in utero and children with low exposure in the first trimester - particularly in the forehead, the study found.
Compared to children not exposed to any alcohol in utero, kids with moderate to high exposure in the first trimester had differences in their eyes, mid-face and chin. Changes in the chin were also seen with binge drinking in the first trimester.
Most women who do drink during pregnancy often stop once they realize they are pregnant, limiting fetal alcohol exposure to the first trimester, the University of Western Australia's Carol Bower writes in an accompanying editorial.
Up to about one in 20 children may be affected by fetal alcohol spectrum disorder (FASD), which can lead to cognitive impairment including irreversible brain damage.
Children exposed to alcohol in the womb may have learning challenges such as deficits in memory or speech as well as behavior problems like hyperactivity.
The study was not designed to prove how or if different levels of alcohol exposure at different points in pregnancy might impact children’s faces, or cause specific developmental problems.
In addition, all of the children in the study were white, and it is possible facial changes associated with alcohol exposure during pregnancy might look different in children from other racial or ethnic groups, the researchers note.
Even so, the findings add to a growing body of evidence on the fetal development effects of even low levels of alcohol consumption during pregnancy, said the University of Washington School of Medicine's Heather Carmichael Olson.
“It is a substance that can change fetal development, and can be associated with lifelong changes in learning and behavior,” Carmichael Olson, who was not involved in the study, said.
“If any amount of prenatal alcohol exposure can lead to physical changes in fetal development, as the current study suggests, so that it’s not just high doses or long-term drinking that have measurable effects, the safest advice that providers can give is that women who want a healthy pregnancy should avoid this biological risk factor if they are considering pregnancy or are pregnant,” Carmichael Olson added.