Having herpes does not prevent you from having a safe, healthy pregnancy and delivering a healthy baby. The vast majority of women with recurrent genital herpes (meaning they were infected before pregnancy) have a transmission risk to their newborn of only about 2%. With proper planning, antiviral therapy, and delivery precautions, that already-low number drops even further.
Why the Timing of Infection Matters Most
The single biggest factor in neonatal herpes risk is whether the mother’s infection is new or longstanding. A first-time primary infection during pregnancy carries a transmission risk as high as 57%, while a recurrent infection (one you’ve had before pregnancy) carries roughly a 2% risk. The difference comes down to antibodies. If you’ve had herpes for months or years, your body has already built up immune defenses that cross the placenta and help protect the baby.
The most dangerous scenario is acquiring herpes for the first time during the third trimester. At that stage, your body hasn’t had enough time to develop protective antibodies before delivery, and the virus is actively replicating at high levels. This is the situation that accounts for most cases of neonatal herpes.
Protecting Yourself From a New Infection During Pregnancy
If you already carry herpes, your main concern shifts to managing outbreaks (covered below). But if your partner has herpes and you don’t, preventing a new infection during pregnancy becomes critical, especially in the final trimester.
Couples in this situation should avoid vaginal, oral, and anal sex during the third trimester entirely, or at minimum during any active outbreak. Condoms reduce transmission but don’t eliminate it, since herpes can shed from skin not covered by a condom. Your partner taking daily suppressive antiviral medication outside of pregnancy also lowers the chance of passing the virus. If you’re unsure of either partner’s herpes status, type-specific blood testing before or early in pregnancy can clarify things and guide your plan.
Antiviral Medication During Pregnancy
Antiviral suppressive therapy, typically started around 36 weeks of gestation and continued until delivery, is standard care for pregnant women with recurrent genital herpes. The goal is straightforward: reduce the chance of an active outbreak at the time of labor so you can deliver vaginally.
Safety data on acyclovir during pregnancy is reassuring. A CDC registry tracking over 300 first-trimester exposures found no increased risk of birth defects compared to the general population. The rate of birth defects among exposed infants was about 4%, consistent with the baseline rate in all pregnancies, and no specific pattern of defects was identified. Valacyclovir, which converts to acyclovir in the body, is also widely used in pregnancy.
Your provider will likely discuss starting suppressive therapy in the final month of pregnancy regardless of how frequently you experience outbreaks. Even women with infrequent recurrences can have asymptomatic viral shedding, and suppressive medication reduces both visible outbreaks and invisible shedding.
How Delivery Decisions Are Made
The mode of delivery depends almost entirely on what’s happening at the time labor begins. If you have no active genital lesions and no prodromal symptoms (the tingling or burning that sometimes precedes an outbreak), vaginal delivery is considered safe. Most women with recurrent herpes deliver vaginally without complications.
If active genital lesions or prodromal symptoms are present when labor starts, a cesarean section is recommended. Delivering before the membranes rupture (before your water breaks) significantly reduces the baby’s exposure to the virus in the birth canal. A C-section doesn’t eliminate all risk, but it provides substantial protection.
This is one of the key reasons suppressive antiviral therapy is started at 36 weeks. By reducing the likelihood of an outbreak at term, it reduces the likelihood of needing a cesarean delivery.
What Neonatal Herpes Looks Like
Understanding the signs of neonatal herpes helps you act quickly in the unlikely event that transmission occurs. Symptoms almost always appear within the first month of life, with most cases showing up between the first and third weeks.
Neonatal herpes presents in three forms, ranging from mild to severe:
- Skin, eye, and mouth disease typically appears in the second or third week of life. The hallmark sign is small fluid-filled blisters on a red base. Eye inflammation is common, and without treatment it can progress to corneal damage.
- Central nervous system disease usually shows up between weeks two and three. Babies may develop fever, poor feeding, seizures, or episodes where they stop breathing. About 60% to 70% of these infants also develop skin lesions at some point.
- Disseminated disease is the most serious form, often appearing within the first three weeks and resembling a severe infection. It can affect the liver, lungs, and brain. Encephalitis occurs in about 75% of disseminated cases.
Early recognition and treatment dramatically improve outcomes in all three categories. If your baby develops unexplained blisters, fever, poor feeding, or unusual lethargy in the first six weeks of life, prompt evaluation is essential.
Breastfeeding With Herpes
Herpes does not prevent breastfeeding. The virus is transmitted through direct contact with active lesions, not through breast milk itself. As long as there are no lesions on your breasts, you can breastfeed normally. Cover any active lesions elsewhere on your body completely, and wash your hands thoroughly before handling your baby.
If you do develop a herpes lesion on one breast, stop breastfeeding from that side until it heals. Don’t use expressed milk from the affected breast either, since the pump or your hands could pick up virus from the lesion. You can continue to breastfeed or pump from the unaffected breast as long as the lesion on the other side stays fully covered.
Planning Conception With a Partner
If both you and your partner have the same type of herpes, there’s no additional transmission concern between you during conception. If only one partner is positive, timing intercourse to avoid outbreaks and using daily suppressive antiviral therapy for the positive partner reduces the risk of transmitting herpes to the uninfected partner. Condoms add another layer of protection during the conception period, though obviously they’re set aside during the specific attempts to conceive.
Some couples where the male partner has herpes and the female partner does not choose to limit unprotected sex to a narrow fertile window each cycle, minimizing the total number of exposures. Others pursue intrauterine insemination to bypass sexual contact altogether, though this is less commonly needed. A conversation with your provider about your specific situation, including herpes type, outbreak frequency, and both partners’ status, can help you design an approach that balances conception goals with safety.
The reassuring reality is that most women with genital herpes have uncomplicated pregnancies and healthy babies. The key steps are knowing your status early, communicating with your care team, taking suppressive medication in late pregnancy, and having a clear delivery plan in place.