Low-carb intake was defined as the lowest 10 percent of the group, roughing lining up with limits imposed by low-carb and gluten-free diets. What's important to note is women who choose to consume less carbohydrates might also be opting to eat less folic acid. (The U.S. Food and Drug Administration mandated in 1998 that all cereals and grains must be fortified with folic acid.)
At this time, researchers can't provide a specific daily intake that is healthiest for pregnant women, but believe this research is a start to understanding more about an unborn baby's health.
The only concrete finding is maternal diet plays an extremely important role in fetal development, Desrosiers said.
"I don't want women to panic when they read this," Desrosiers said. "For the scientific community, we need to look into this deeper. For the public, women should have a conversation with their doctor about special dietary practices."
The Centers for Disease Control and Prevention sponsored the study, also authored by Anna Maria Siega-Riz, Bridget Mosley and Robert Meyer.