Sexual health

Herpes and Pregnancy: Protecting Your Baby

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Herpes and pregnancy usually mix safely. Long-standing herpes carries under a 1 percent chance of infecting a newborn, while a first infection late in pregnancy is far riskier. Antivirals in the final weeks and a cesarean only if sores are present at delivery keep newborn risk low.

Last updated: July 2026

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Can herpes affect my baby during pregnancy?

Herpes can affect a baby, but for most pregnant people who already have it, the risk is low. The concern is neonatal herpes, a rare but serious newborn infection that usually happens when the baby is exposed to the virus during vaginal birth.

For someone with long-standing genital herpes, protective antibodies cross to the baby, and the chance of transmission at delivery is under 1 percent. Sharing your history early lets your prenatal team plan around it. According to ACOG's prepregnancy guidance, reviewing infections and medications before and during pregnancy is a routine part of care that the College recommends 1.

Why is a new infection late in pregnancy the biggest concern?

A brand-new herpes infection late in pregnancy is the highest-risk situation, and it is the opposite of what many people fear. When someone catches herpes for the first time in the third trimester, the body has not yet made antibodies to pass to the baby.

So if the virus is active at delivery, the transmission risk rises sharply, often cited in the range of 30 to 50 percent. This is why a partner's status matters: a pregnant person who is negative but has a partner with herpes is the one who most needs a prevention plan. Long-standing herpes, by contrast, keeps newborn risk under 1 percent. Recognizing early pregnancy changes is a good moment to raise your history.

How do antivirals and delivery planning help?

Antivirals and thoughtful delivery planning are the two tools that keep newborn risk low. Many clinicians suggest a daily antiviral in the final weeks of pregnancy, often from around 36 weeks, to reduce the chance of an outbreak when labor starts.

At delivery, the plan hinges on what is happening then: if there are active sores or warning symptoms, a cesarean is usually recommended to avoid exposing the baby; if there are none, vaginal birth is often appropriate. These steps mirror a broader obstetric principle of using late-pregnancy assessment and delivery decisions to prevent passing infection to a newborn 2. Recognizing an active herpes outbreak near your due date is exactly what can change the delivery plan.

What should I tell my prenatal team?

Telling your prenatal team about herpes early is the single most useful thing you can do. Your history lets them decide on testing, plan late-pregnancy antivirals, and prepare for delivery, and it prompts a conversation about your partner's status if you are not the one who carries the virus.

After birth, the caution shifts: newborns are vulnerable to the cold-sore virus too, so anyone with an active cold sore avoids kissing the baby, and careful handwashing matters. According to prenatal screening guidance and the WHO self-care guideline, planning ahead of a pregnancy, or as early as possible within one, gives the most options 3. Knowing how to tell whether you have an STI helps you and a partner start that discussion.

When herpes in pregnancy needs your obstetric team

Any sign of an outbreak near your due date, or a new infection during pregnancy, is a reason to reach your obstetric team promptly rather than wait. Your obstetrician or midwife coordinates testing, antivirals, and the delivery plan, and adjusts quickly if symptoms appear as labor nears.

Because a first infection in the third trimester carries the most risk, a negative pregnant person with a partner who has herpes deserves an early prevention plan. This is care led by your obstetric clinician, not something to manage from general reading alone. Gale can help you prepare the questions and history your team will want at that first prenatal visit.

Common questions

It is possible but uncommon, especially if your herpes is not new. The highest risk comes from a first infection late in pregnancy; long-standing herpes carries a much lower risk.

Not always. A cesarean is usually recommended only if you have active sores or warning symptoms when labor begins. Without them, vaginal birth is often possible.

Many clinicians suggest a daily antiviral in the last weeks to lower the chance of an outbreak at delivery. Your obstetric team decides based on your history.

Yes. Sharing your history early lets your team plan testing, antivirals, and delivery so newborn risk stays as low as possible, even if it feels awkward to bring up.

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When herpes in pregnancy needs prompt attention

  • —Genital sores, tingling, or a suspected outbreak near your due date are a reason to contact your obstetric team the same day.
  • —A new genital herpes infection during pregnancy, especially in the third trimester, is a reason to seek prompt obstetric review.
  • —A partner with herpes when you are pregnant and test negative is a reason to seek clinician guidance on prevention.
  • —A newborn with blisters, poor feeding, or unusual sleepiness is a reason to seek urgent medical care right away.

If a newborn has blisters, fever, poor feeding, or unusual drowsiness, seek emergency care right away or go to the nearest emergency room, as neonatal herpes needs immediate treatment.

This article is general health education, not medical advice. A pregnancy affected by herpes should be managed with your obstetric clinician, who will tailor antiviral and delivery decisions to your situation.

References

  1. 1.American College of Obstetricians and Gynecologists (2019). ACOG Committee Opinion No. 762: Prepregnancy Counseling. Obstetrics & Gynecology. doi:10.1097/AOG.0000000000003013 ✓ACOG's prepregnancy counseling opinion recommends discussing infections and medications before conception and planning care ahead of pregnancy.
  2. 2.American College of Obstetricians and Gynecologists (2020). Prevention of Group B Streptococcal Early-Onset Disease in Newborns: ACOG Committee Opinion, Number 797. Obstetrics & Gynecology. doi:10.1097/AOG.0000000000003668 ✓ACOG's newborn group B strep opinion illustrates the general obstetric principle of using late-pregnancy assessment and delivery management to reduce the risk of passing infection to a newborn.
  3. 3.World Health Organization (2022). WHO guideline on self-care interventions for health and well-being, 2022 revision. World Health Organization (WHO). link ✓The WHO self-care guideline supports STI screening and prevention as part of planning for a healthy pregnancy.

3 sources, numbered by first appearance. General health information, not medical advice. AI-assisted editorial content — every citation independently verified. Editorial policy

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