GLP-1 receptor agonists — including semaglutide (Ozempic, Wegovy) and tirzepatide (Mounjaro, Zepbound) — have transformed the treatment of Type 2 diabetes, obesity and cardiovascular disease. Beyond these primary uses, however, patients and doctors are noticing an unexpected side effect: a rise in surprise pregnancies, widely dubbed “Ozempic babies” across social media.
This trend is largely driven by two key biological factors: restored regular ovulation and reduced oral birth control pill absorption. Ahead, learn how GLP-1s may affect ovulation and fertility, what to know about birth control while taking them and how to safely navigate these medications if you are (and aren’t) planning a pregnancy.
The “Ozempic Babies” Phenomenon: Why Are Unplanned Pregnancies Surging?
There are several distinct factors linked to the uptick in surprise pregnancies among patients taking GLP-1 medications.
1. Improved insulin sensitivity and restored ovulation
“One of the biggest factors is that metabolic health and reproductive health are closely connected,” says Dr. Anate A. Brauer, a board-certified reproductive endocrinologist at RMA of New York. “In patients with insulin resistance, obesity or polyendocrine metabolic ovarian syndrome (PMOS), elevated insulin levels can disrupt the hormonal signaling necessary for regular ovulation.”
By lowering blood glucose and improving insulin response, these medications remove the hormonal roadblock suppressing the ovaries, allowing normal follicular development to resume.
2. Hormonal rebalancing through fat loss
Fat tissue is hormonally active and directly impacts fertility.
“Adipose tissue contains aromatase, an enzyme that converts androgens into estrogens,” Brauer explains.
With significant fat loss, aromatase activity decreases, bringing estrogen and androgen levels into better balance. This supports normal hormonal signaling between the brain and ovaries, allowing follicle-stimulating hormone (FSH) to function properly, follicles to develop and regular ovulation to resume.
3. Silent ovulation before a period returns
For patients with irregular or absent periods, fertility often returns without warning.
“Ovulation happens before menstruation,” Brauer says. “For someone whose ovarian function resumes after a stretch of absent periods, ovulation may occur before they ever see their period return.”
Because ovulation precedes menstruation, patients can conceive on their very first restored cycle without ever seeing a baseline period return.
4. Reduced effectiveness of oral birth control
Restored fertility is only half the equation — contraceptive absorption is the other. Because GLP-1s (especially tirzepatide) delay gastric emptying, oral birth control pills may pass through the digestive tract too slowly or unpredictably to maintain consistent hormone levels in the bloodstream.
Additionally, gastrointestinal side effects like severe vomiting or diarrhea can prevent oral contraceptives from properly absorbing into the body.
[READ: How to Find a Good Fertility Clinic.]
Navigating Birth Control on GLP-1s
For patients taking tirzepatide (Mounjaro, Zepbound) who rely on oral contraceptives, the Food and Drug Administration recommends switching to a nonoral birth control method or using a backup barrier method like condoms.
“The backup method should be used for the first four weeks of tirzepatide use and then for the four weeks after any dose increase,” says Dr. Jacqueline Hairston, a maternal-fetal medicine specialist at Northwestern Medicine.
Which birth control methods are safe with GLP-1s?
Contraceptive options that bypass the digestive tract completely offer the most reliable protection:
| Contraceptive Method | Examples/Details |
| IUDs | Both hormonal (progestin) and nonhormonal (copper) options |
| Contraceptive implants | Nexplanon |
| Vaginal rings | NuvaRing |
| Injectable contraceptives | Depo-Provera (or generic medroxyprogesterone acetate) |
| Barrier methods | Condoms |
[READ: Best Fertility Supplements]
GLP-1s and PMOS: Indirect Benefits for Ovulatory Health
While GLP-1s are not approved as fertility treatments, their ability to treat underlying metabolic dysfunction offers indirect reproductive benefits for women with PMOS.
“PMOS is strongly associated with insulin resistance,” Brauer says. “When insulin levels are too high, they stimulate androgen production in the ovaries, disrupting normal ovulation. By improving insulin sensitivity and facilitating weight loss, GLP-1 medications help reduce those metabolic disruptions so regular ovulation can resume.”
[READ: GLP-1 Microdosing: Risks, Benefits and What to Know Before Changing Your Dose]
Pregnancy and Breastfeeding: Safety Warnings and Discontinuation
Although GLP-1 medications have been around for more than 20 years, there is still limited human data on their safety during pregnancy. For that reason, these medications are generally not recommended for weight loss during pregnancy.
“If you become pregnant while using a GLP-1, the recommendation is to immediately stop the medication,” Hairston says. “Depending on the type of GLP-1, it can take anywhere between 12 hours and a week for your body to clear out half of the medication.”
The FDA label recommends stopping semaglutide at least two months before a planned pregnancy because it has a long half-life.
When it comes to breastfeeding, recommendations are more nuanced and depend on the specific medication and formulation.
“For instance, semaglutide was not detected in the milk of lactating people taking the injectable form,” Hairston says. “However, oral semaglutide formulations can contain additional ingredients that allow the medication to be better absorbed; these ingredients may build up in the baby’s body.”
If you’re unsure whether a medication is safe to take while breastfeeding, the Drugs and Lactation Database (LactMed) provides information about how medications may affect breastfeeding parents and infants.
“We are still getting more real-time data on women of reproductive age,” says Dr. Christina Boots, a reproductive endocrinology and infertility specialist at Northwestern Medicine. “In my opinion, we need to individualize counseling and offer comprehensive support as women discontinue these medications for pregnancy.”
For personalized guidance on navigating your health after pregnancy, consider preparing specific questions to ask your doctor at your postpartum checkup.
[READ: Best Prenatal Vitamins]
Male Reproductive Health: How GLP-1s Affect Testosterone and Sperm
Men’s reproductive health may also improve indirectly while taking GLP-1s. Research has looked at men with obesity, diabetes or obesity-related low testosterone. Obesity and insulin resistance can disrupt hormone signaling, much like they do in women, and are linked to lower testosterone levels and impaired semen quality.
“As men lose weight and their metabolic health improves, testosterone levels may rise,” Brauer says. “Emerging studies of GLP-1 receptor agonists have reported increases in total testosterone and, in some populations, improvements in semen parameters.”
But more research is needed to determine whether this class of medications can directly improve male fertility.
“We shouldn’t assume that every patient’s testosterone or sperm parameters will improve,” Brauer says.
[READ: Best Testosterone Supplements]
Bottom Line
As of right now, GLP-1s aren’t fertility treatments, but by improving metabolic health, they may help restore ovulation and increase the chance of pregnancy for some people, which is why the term “Ozempic babies” has become a part of many conversations online. That makes it important to consider your reproductive goals before starting treatment and to have a plan for contraception or pregnancy with your healthcare team.
“Every person is different, and not everyone needs to lose weight,” Boots says. “Infertility is also a disease and not someone’s fault. Ensuring that we are providing individualized, empathetic, multidisciplinary care to these women is so important.”
Frequently Asked Questions (FAQ)
More from U.S. News
How to Pay for a Nursing Home With No Money
Everything You Need to Know About the Medicare Trust Fund
Senior Living Roommates & Home Sharing: How to Find the Best Match and Avoid Conflict
GLP-1s and Reproductive Health: What to Know About “Ozempic Babies,” Fertility and Birth Control originally appeared on usnews.com
