Yes, it is safe to continue breastfeeding through most common illnesses, including colds, the flu, stomach bugs, and COVID-19. In fact, stopping breastfeeding when you’re sick can actually remove a layer of protection your baby is actively receiving. Your breast milk adapts in real time to infections you encounter, producing targeted antibodies that help shield your infant from the very illness making you miserable.
How Your Milk Protects Your Baby
When you catch a cold or come down with the flu, your immune system doesn’t just fight the infection in your body. It also dispatches protective antibodies directly into your breast milk. This happens through two routes: immune cells already living in your mammary gland tissue produce certain antibodies on-site, while others travel from your bloodstream into the milk.
The process is remarkably specific. When you encounter a respiratory, intestinal, or other mucosal infection, your body recruits new immune cells to both the infection site and the mammary gland simultaneously. This means your milk doesn’t just carry generic immune support. It contains antibodies tailored to whatever pathogen you’re currently fighting, essentially giving your baby a custom-made defense before they even show symptoms. The severity of your illness also influences the response: a more serious infection triggers a broader and more abundant antibody output in your milk.
This is especially important for babies under six months, who are too young to receive flu vaccines and have immature immune systems. Breastfed infants are less vulnerable to infections, including severe lower respiratory illnesses, compared to infants who are not breastfed.
Common Illnesses That Are Safe to Nurse Through
The list of illnesses where breastfeeding should continue is long. Colds, influenza, sinus infections, sore throats, ear infections, urinary tract infections, stomach viruses, and COVID-19 all fall into this category. None of these pass through breast milk to infect your baby. The flu, for example, spreads through respiratory droplets, not through milk. The same is true for most common bacterial and viral infections.
Fever on its own does not affect your ability to breastfeed or the quality of your milk. If anything, a fever signals that your immune system is actively producing the antibodies that will end up protecting your baby. If you got a flu vaccine during pregnancy or while breastfeeding, those antibodies also transfer through your milk, adding another layer of protection.
The Few Exceptions
Only a handful of conditions require you to stop breastfeeding, and they are rare. The CDC identifies these specific situations where mothers should not breastfeed:
- HIV that is not being treated with antiretroviral therapy, or HIV that hasn’t reached sustained viral suppression during pregnancy or after delivery.
- HTLV-1 or HTLV-2 infection (human T-cell lymphotropic virus), a rare viral infection unrelated to HIV.
- Ebola virus disease, whether suspected or confirmed.
- Active, untreated tuberculosis. This is temporary. Once you’ve been treated for two weeks and a doctor confirms you’re no longer contagious, you can resume nursing.
- Use of certain illicit drugs such as cocaine, PCP, or non-prescribed opioids. If you’re on stable methadone or buprenorphine maintenance therapy, breastfeeding is encouraged.
If you don’t have one of these conditions, continuing to breastfeed is the recommended approach.
Safe Medications for Nursing Mothers
One of the biggest concerns when you’re sick is whether you can take anything to feel better. Acetaminophen (Tylenol) and ibuprofen (Advil, Motrin) are both considered safe choices for pain and fever reduction while breastfeeding. Studies tracking acetaminophen in breast milk found that a breastfed infant receives roughly 1 to 2 percent of the mother’s weight-adjusted dose, which works out to about 0.5 percent of the lowest dose that would normally be given directly to an infant. Adverse effects in breastfed infants from these medications are rare.
Decongestants are a different story. Pseudoephedrine, the active ingredient in many cold and sinus products (like Sudafed), can significantly reduce your milk supply. In one study, a single 60 mg dose cut 24-hour milk production by 24%, dropping average output from about 784 mL to 623 mL per day. If you’re trying to maintain your supply, a topical nasal decongestant spray is a safer alternative that avoids this systemic effect. Always check the active ingredients on combination cold medicines, since many contain pseudoephedrine alongside other drugs.
Keeping Your Baby Healthy While You Nurse
While your milk won’t transmit your illness, your hands, breath, and sneezes certainly can. The biggest risk to your baby isn’t the breastfeeding itself but the close physical contact that comes with it. A few simple precautions make a significant difference:
- Wash your hands thoroughly before picking up your baby and before every feeding.
- Wear a mask while nursing and during any close contact. This is especially important with respiratory infections like the flu or COVID-19.
- Avoid coughing, sneezing, or breathing directly on your baby’s face.
- Clean frequently touched surfaces like your phone, the changing table, and crib rails.
These precautions apply whether you’re breastfeeding or bottle-feeding. You’re in close contact with your baby either way, so the feeding method doesn’t change the transmission risk from droplets or contaminated hands.
What to Do If You’re Too Sick to Nurse
Sometimes the issue isn’t safety but sheer exhaustion. A high fever, body aches, or severe nausea can make holding your baby for a feeding feel impossible. In that case, pump or hand-express your milk so someone else can bottle-feed it to your baby. The milk is still beneficial and still carries those illness-specific antibodies, even when delivered in a bottle.
Staying hydrated matters more than usual when you’re sick and lactating. Illness-related dehydration, vomiting, and reduced appetite can temporarily dip your supply. Drinking water, broth, or electrolyte drinks and eating when you can helps keep production steady. Nursing or pumping on your regular schedule (rather than skipping sessions because you feel terrible) sends your body the signal to keep making milk. Skipping sessions is actually more likely to hurt your supply than the illness itself.
If your baby also gets sick, continuing to breastfeed is especially important. Sick infants need extra fluids to stay hydrated, and breast milk is easier to digest than formula or other liquids. Many babies who refuse other foods will still nurse.