Is Covid-19 Vaccine Safe During Pregnancy?

The short answer: considered safe, and recommended by obstetric groups

The COVID-19 vaccine is considered safe at any point in pregnancy. The leading obstetric and pediatric groups, including the American College of Obstetricians and Gynecologists (ACOG) and the American Academy of Pediatrics (AAP), actively recommend it for people who are pregnant or breastfeeding. One nuance worth knowing: as of 2025-2026, the CDC shifted its stance to framing the shot as an individual, shared clinical-decision matter rather than a blanket recommendation, while ACOG and others continue to recommend it outright, so you may hear it described both ways. The mRNA vaccines (Pfizer-BioNTech and Moderna) have the largest pregnancy safety record, now drawn from more than a million vaccinated pregnancies, and they are not live vaccines, so they cannot give you or your baby COVID-19. They can be given in any trimester, including the first, with no need to delay until a particular week.

Why obstetric groups recommend it: the mechanism

An mRNA vaccine delivers a short strand of genetic instructions that tells your own cells to make a harmless copy of the virus's spike protein, which your immune system then learns to recognize. That mRNA never enters the nucleus of your cells, does not change your DNA, contains no live virus, and breaks down within days, so it is not designed to reach the baby. What does cross the placenta is the helpful part: the protective antibodies your body makes in response, which can give your newborn some passive protection in their first months, before they're old enough to be vaccinated themselves. The risk on the other side matters too: pregnancy itself makes a COVID-19 infection more dangerous, raising the chance of severe illness, ICU admission, and the need for breathing support, and infection has been linked to higher rates of preterm birth, preeclampsia, and stillbirth. The recommendation rests on lowering those serious risks for both of you.

Timing, doses, and what to expect

There is no special pregnancy dose and no need to space the vaccine away from your pregnancy on its own account: you follow the same up-to-date schedule recommended for adults, including any current updated formulation, at whatever stage you are. It can be given alongside other pregnancy-recommended shots such as Tdap and the flu vaccine in the same visit. Side effects are the usual ones and are not unique to pregnancy: a sore arm, tiredness, headache, muscle aches, or a low-grade fever for a day or two. If you do run a fever afterward, acetaminophen is the pregnancy-friendly way to bring it down, since a sustained high fever is worth treating in pregnancy regardless of cause. If you've ever had a severe allergic reaction to a vaccine ingredient, flag it to your provider beforehand; otherwise no extra pregnancy-specific precautions are needed.

What about breastfeeding?

Breastfeeding is a reassuring picture, and ACOG recommends the vaccine while nursing. Studies that looked hard for it have found at most trace, already-broken-down fragments of vaccine mRNA in a minority of milk samples in the first day or two after a dose, with no intact spike protein and no signal of harm to nursing infants. What is reliably detected in the milk of vaccinated parents is COVID-19 antibodies, which may offer your baby a measure of passive protection. So unlike some medications where the pregnancy and nursing answers diverge, here they point the same way: vaccination is supported in both situations, and there is no need to pause feeding or 'pump and dump' around your dose.

The bottom line: the COVID-19 vaccine is considered safe throughout pregnancy and while breastfeeding, and obstetric and pediatric groups such as ACOG and the AAP recommend it, even as the CDC now frames it as a shared decision with your clinician. It's a non-live mRNA vaccine that can't cause infection, doesn't alter DNA, and passes protective antibodies to your baby, while lowering your own elevated risk of severe illness. If you choose it, stay current with the recommended schedule at any trimester, and treat any post-shot fever rather than letting it ride. This page is general education, not medical advice, so bring your specific history, allergies, and any prior reactions to your own provider, who is the final word for your pregnancy.