How Can Lyme Disease Affect Babies?

Lyme disease during pregnancy has raised concerns about possible effects on maternal health and infant outcomes. In a recent study examining Lyme disease pregnancy outcomes, researchers used an international cross-sectional survey to explore how Lyme disease occurring during or around pregnancy may affect both mothers and their children.

Participants were recruited primarily through a Lyme disease–focused organization, although eligibility was open to anyone over 18 years of age who had been pregnant. The study included individuals who developed Lyme disease symptoms after pregnancy as well as those who had symptoms before pregnancy but were not treated for Lyme disease for years.

Investigators compared individuals diagnosed with Lyme disease or probable Lyme disease with 200 participants (28%) who did not have Lyme disease.

Tick Exposure and Rash Recall

“Only 45% of diagnosed Lyme disease participants and 61% of suspected Lyme disease participants recalled a tick bite, and fewer than 40% noticed an erythema migrans rash,” wrote the authors.

Maternal Health During and After Pregnancy

Mothers who were more likely to have Lyme disease at the time of pregnancy reported higher rates of extreme fatigue, joint pain, fever of unknown origin, and postpartum depression compared with participants without Lyme disease.

However, the authors emphasized that the study could not determine whether these complications were directly related to Lyme disease, pregnancy itself, or other contributing factors.

Pregnancy and Neonatal Outcomes

Children born to mothers who were more likely to have Lyme disease during pregnancy did not differ from controls in several important pregnancy outcomes. These included gestational age at delivery, intrauterine growth restriction, congenital anomalies, and rates of hyperbilirubinemia.

Childhood Health Findings

The authors reported that children born to mothers who likely had Lyme disease during pregnancy demonstrated a wide range of health issues. These included musculoskeletal, gastrointestinal, orthopedic, cardiovascular, respiratory, sleep, skin rash, fever, concentration, sensory, and vision problems.

Importantly, the study could not determine whether these conditions were caused by Lyme disease, genetic factors, environmental exposures, or infections occurring after birth.

Study Limitations

The authors acknowledged several limitations. Participants were recruited largely through Lyme disease advocacy groups in North America, which may limit how broadly the findings apply.

Recall bias was also a concern, as many pregnancies occurred 10 to 70 years before the survey was completed. Because the study was cross-sectional, it cannot establish cause-and-effect relationships.

Clinical Implications

Despite these limitations, the authors concluded that the survey provides an important foundation for future research on Lyme disease in pregnancy.

They also suggested that treatment for Lyme disease before or during pregnancy may reduce the likelihood of severe health problems in newborns and children, although treatment may not eliminate all potential risks.