After nine months of pregnancy, it’s natural to want to focus on your own health. And GLP-1 medications like semaglutide (Ozempic® and Wegovy®) and tirzepatide (Mounjaro® and Zepbound®) are increasingly becoming part of that conversation. Calls to the InfantRisk Center at Texas Tech University about semaglutide during lactation rose by over 500% between 2021 and 2024.

Can you take GLP-1 while breastfeeding? For now, clinical guidelines recommend waiting until after breastfeeding to start a GLP-1 treatment. This guide explains GLP-1 and breastfeeding safety considerations: what we know so far, what we don’t, and what you can do in the meantime.

Does semaglutide pass into breast milk?

Research on the subject of GLP-1s and breastfeeding is early and limited. The only published human study—from the Infant Risk Center at Texas Tech University in 2024—included eight women, all using injectable semaglutide at doses between 0.25 and 1 mg per week. None were breastfeeding newborns, and all were mixed-feeding, which means they fed their babies both breast milk and formula. 

The results were reassuring: Semaglutide wasn’t found in any of the 24 breast milk samples collected at 0, 12, and 24 hours after dose. And most importantly, all eight infants showed normal growth and development during the weeks they were breastfed while their mothers were on the medication.

These findings could be a result of semaglutide’s molecular structure. Semaglutide is a large peptide molecule, and large molecules don’t usually go from the bloodstream into breast milk. On top of that, semaglutide breaks down almost entirely in the digestive system. Even in the oral tablet form—which uses an absorption booster to protect the drug from stomach acid—only about 1% survives to reach the bloodstream. An infant swallowing trace amounts in breast milk would absorb even less.

That said, the 2024 study measured only whether the drug was present in milk, and the sample size was very small. It didn’t assess if semaglutide changed the nutritional content of breast milk, and it didn’t follow the infants beyond the study period. These gaps remain open.

Why are GLP-1 medications still not recommended during breastfeeding?

The drug transfer process we explained above is only one of the concerns. Here’s why, for now, healthcare providers generally advise against taking GLP-1s, including semaglutide, while breastfeeding:

• Milk supply: The early postpartum period is when your body is building its milk supply. The more your baby feeds, the more milk your body produces. But breastfeeding takes roughly 330 to 500 extra calories a day, and if intake drops below about 1,800 calories, production can slow. GLP-1s reduce hunger and slow digestion, making it easy to fall below that threshold without realizing it.
• Oral semaglutide risks: The pill version of semaglutide, Rybelsus® and Ozempic®, contains an absorption enhancer called SNAC that helps the medication survive the stomach. SNAC passes into breast milk. Because the infants’ livers are still developing, they may not clear it as quickly as adults. The FDA labels for these pills explicitly note this concern.
• Limited tirzepatide data: A 2026 study gave 11 lactating women a single 5 mg dose of tirzepatide, the active ingredient in Mounjaro® and Zepbound®. Researchers collected 171 milk samples and detected no tirzepatide in 164 (96%). The remaining seven contained a total of less than 0.02% of the mother’s dose. But the study tested a single dose, not the repeated weekly dosing that real-world treatment requires. That means the real impacts could be greater.

What are safe ways to manage weight while breastfeeding?

For many people, postpartum weight management is a health concern. A 2024 study in Cardiovascular Diabetology found that those who retained 6% or more of their pre-pregnancy weight by five years after giving birth face higher risks of pre-diabetes, unhealthy cholesterol levels, and other early markers of heart disease. 

If your goal is steady progress that protects both your milk supply and your long-term health, consider these tried-and-true strategies.

Set a realistic timeline

Gradual and sustainable weight loss is best in any scenario, but especially during breastfeeding. Between 50% and 75% of women still carry some pregnancy weight at the one-year mark. A safe pace during breastfeeding is shedding about half a kilogram per week. 

Eat enough, and eat well

Restrictive dieting during lactation is counterproductive. It can compromise your milk supply and leave you feeling exhausted. The focus should be on nutrient-dense meals that fuel milk production and give your baby lots of different flavors to taste: protein, healthy fats, whole grains, fruits, and vegetables. The Academy of Nutrition and Dietetics, along with most guidelines, recommends staying well above 1,500–1,800 calories a day.

Build activity back gradually

The American College of Obstetricians and Gynecologists (ACOG) recommends at least 150 minutes of moderate-intensity movement per week after delivery. Reaching this goal doesn’t require a structured exercise program. Three 10-minute walks a day counts. 

The ACOG states that exercise during breastfeeding doesn’t affect milk quality or supply, but it does improve mood, sleep, and cardiovascular fitness. And a meta-analysis of 27 postpartum weight-loss trials found that combining regular movement with adequate nutrition is more effective than either on its own. 

Ask for help

The postpartum period puts strain on your body and your mental health. If you're struggling with low mood, anxiety, or pressure to lose weight quickly, the best you can do for your baby and yourself is reaching out to a provider. Any form of stress, including weight-related stress, can interfere with breastfeeding by disrupting the hormonal signals that regulate milk release.

When can you consider starting a GLP-1 after breastfeeding?

After you’ve fully weaned, there’s no required waiting period before starting a GLP-1 medication. No professional body or FDA label specifies a gap between your last breastfeed and your first dose. But it’s important to note that sporadic or comfort nursing still counts as breastfeeding.

If you’ve stopped breastfeeding and are ready to start a GLP-1, the next step is a medical evaluation. Your provider will review your health history, current weight, and any conditions that may have developed during or after pregnancy, like gestational diabetes or insulin resistance, to decide whether GLP-1s are the right fit. 

GLP-1 treatment starts at the lowest dose and increases gradually over a few weeks, so there’s a built-in adjustment period before you reach a full dose. This minimizes common symptoms like nausea and diarrhea. Some people also notice temporary hair thinning when starting GLP-1 treatment, which is usually tied to the pace of weight loss rather than the medication itself.

Supporting your postpartum health with Maven Clinic

After pregnancy, you don’t have to figure out how to take care of your baby and yourself alone. When you’re ready, Maven Clinic’s GLP-1 Care program pairs brand-name prescriptions with provider visits and nutrition and strength-building guidance. And if now isn’t the right time for medication, our postpartum and pediatric specialists can help you work out a plan that supports your health and your baby's at every stage.

FAQ

Is semaglutide safe while breastfeeding?

Semaglutide’s safety while breastfeeding is not yet clearly established, so it’s not recommended at this time.

Does Ozempic® pass into breast milk?

Based on the only published human study, injectable Ozempic® while breastfeeding doesn’t appear to pass into milk in detectable amounts. The 2024 study from the InfantRisk Center at Texas Tech University tested breast milk from eight women using injectable semaglutide and didn’t find the drug in any of the 24 samples. All eight infants showed normal growth and development. However, Ozempic® now comes as a tablet, which contains SNAC, an absorption enhancer with separate safety concerns during lactation.

When can I restart GLP-1s after breastfeeding?

You can start the conversation with your provider once breastfeeding has fully stopped. There’s no required waiting period between your last breastfeed and your first dose.