Lyme Disease in Pregnancy: Risks to the Baby and What to Watch For
Can Lyme disease affect your baby?
Is congenital Lyme disease possible?
Here’s what pregnant women need to know.
Lyme disease in pregnancy raises important questions about risks to both the mother and the developing baby.
While many pregnancies result in healthy outcomes, case reports and studies suggest that complications can occur—particularly if Lyme disease is not recognized and treated early.
Can Lyme Disease Be Passed to the Baby?
One of the most common concerns is whether Lyme disease can be transmitted during pregnancy.
The first confirmed case of maternal-fetal transmission was described in 1985, when a mother infected during the first trimester delivered prematurely. Spirochetes were later found in multiple fetal tissues. :contentReference[oaicite:0]{index=0}
This raised early concerns about congenital Lyme disease, although the full risk remains under study.
Lyme Disease Pregnancy Complications
Researchers have reported a range of potential Lyme disease pregnancy complications, including:
- Preterm birth
- Stillbirth
- Congenital abnormalities (in rare cases)
- Neurologic symptoms in infants
As noted in the literature, complications such as stillbirth and congenital malformations have been reported in some cases. :contentReference[oaicite:1]{index=1}
What Studies Show About Outcomes
In one study of 11 pregnant women with Lyme disease:
- All mothers were treated with antibiotics
- Most babies were born healthy
- One premature birth occurred
- One infant had skin findings that later resolved
At one-year follow-up, nearly all mothers had recovered, though one required additional treatment for persistent symptoms. :contentReference[oaicite:2]{index=2}
Symptoms of Lyme Disease During Pregnancy
Symptoms during pregnancy may include:
- Erythema migrans rash
- Joint pain
- Neurologic symptoms
- Flu-like illness
Importantly, some women may test positive without obvious symptoms, making diagnosis more challenging.
Start here: Lyme Disease Symptoms Guide
Why Pregnancy Requires Special Attention
Pregnancy alters the immune system, which may increase susceptibility to infection and affect disease progression.
This makes early recognition and treatment especially important.
Experts recommend:
- Prompt antibiotic treatment if Lyme disease is diagnosed
- Close clinical follow-up
- Monitoring for neurologic, cardiac, or systemic symptoms
Should Babies Be Evaluated?
Some experts recommend evaluating newborns if the mother had Lyme disease during pregnancy.
Reported findings in some cases include:
- Small size at birth
- Skin changes
- Neurologic symptoms
- Muscle tone abnormalities
However, many infants born to treated mothers are healthy.
Clinical Takeaway
Lyme disease in pregnancy does not always lead to complications—but it should never be ignored.
Early diagnosis and treatment are key to reducing potential risks to both mother and baby.
If Lyme disease is suspected during pregnancy, prompt evaluation is essential.
Related Reading
Dr. Daniel Cameron, MD, MPH
Lyme disease clinician with over 30 years of experience and past president of ILADS.
Symptoms • Testing • Coinfections • Recovery • Pediatric • Prevention
I was 17 weeks pregnant in 2004 and was infected with LB. I was lucky my baby was born but has allergies I or any family member does not. I developed the rash and was given 250 mg of amoxicillin to take once a day. It’s a miracle my son even survived because there were no follow ups on LB treatment for us.
My son was born in 1998 with Lyme! I wasn’t aware that I had Lyme while I was pregnant, my pregnancy had many complications including a very long labor(48 hours). My Lyme was diagnosed by my son’s pediatrician Dr. Jones who referred me to a Specialist. My son was diagnosed at 3 weeks old.
Has anyone seen or described partial deafness or intractable tinnitus from neuro-Lyme in LB+ pregnant women or their infected offspring? Would such mothers benefit from iv ceftriaxone at full doses, in order to treat the cerebrospinal fluid, cranial nerves, and central nervous system?