IBD and Pregnancy: Planning, Medications and Flare Prevention

Most women with Crohn’s disease or ulcerative colitis can have a healthy pregnancy and a healthy baby. The biggest factor in how it goes is how well your IBD is controlled around conception and during the nine months that follow. The Crohn’s & Colitis Foundation says women with IBD can have healthy pregnancies and infants, though they face a higher chance of complications such as miscarriage and premature delivery. Planning ahead, keeping your maintenance therapy on track and getting your gastroenterologist and obstetrician working together lowers those risks.

This guide covers what the current guidelines say, how medications are handled, and what to do before, during and after pregnancy. It is general education, not a treatment plan. Your own medications should only change on the advice of your gastroenterologist.

Precision Digestive HealthPlan IBD Care Around PregnancyDr. Meet Parikh provides IBD treatment and personalized gastroenterology care for patients in South Plainfield, New Jersey.Visit Precision Digestive Health

TL;DR

• Disease activity, not the medicine, is usually the bigger threat. Active IBD at conception is linked to preterm birth and low birth weight.
• Aim for documented remission, ideally 3 to 6 months before you try to conceive.
• Most biologics and 5-ASA drugs are generally continued through pregnancy. Methotrexate must stop at least 3 months before conception, and JAK inhibitors and S1P modulators usually need to stop well in advance.
• Do not stop a stable medication on your own because you are pregnant or planning to be. Call your GI first.
• Breastfeeding is encouraged for most women with IBD, and most IBD medications are compatible with it.

Table of Contents

• How IBD affects fertility and pregnancy
• What the 2025 global guidelines changed
• Step one: get into remission before you conceive
• IBD medications and pregnancy
• What about ulcerative colitis specifically?
• During pregnancy: monitoring and warning signs
• Delivery and the postpartum months
• Our perspective
• Plan your IBD care with us
• A preconception checklist
• FAQ
• Sources

How IBD affects fertility and pregnancy

IBD is often diagnosed in the years when people start families. The Foundation notes that about half of people with IBD are diagnosed before age 35, so this question comes up constantly in clinic.

The short version:

• Fertility. Beyond the Basics aside, the Foundation’s guidance and expert consensus point the same way: when IBD is well controlled, it generally does not stop you from getting pregnant. Active inflammation, poor nutrition and surgery involving the pelvis are the situations where fertility can be affected, so discuss any history of surgery with your care team.
• Pregnancy risks. Compared with women without IBD, women with IBD are more likely to have complications such as miscarriage, premature delivery and complications of labor, and this can persist even when the disease is in remission.
• Active disease is the driver. Data from the PIANO registry, summarized by the American College of Gastroenterology, link IBD flares and steroid use during pregnancy to adverse outcomes for infants.

That last point reshapes the whole conversation. The goal is not a pregnancy with the least medicine. The goal is a pregnancy with the least inflammation.

What the 2025 global guidelines changed

In 2025, an international group published the Global Consensus Statement on the Management of Pregnancy in Inflammatory Bowel Disease. Before it, advice varied by region, and that inconsistency sometimes led to patients stopping effective drugs unnecessarily. The American College of Gastroenterology’s summary says the statement was written to standardize care and reduce avoidable flares.

According to Medscape’s coverage, the guidelines recommend continuing biologics and low-risk medications through pregnancy and lactation, and recommend that all women with IBD receive preconception counseling and be followed as high-risk pregnancies. In practice that means:

1. A preconception visit with your gastroenterologist, not only your OB.
2. A plan for monitoring disease activity throughout pregnancy.
3. A shared plan between GI and obstetrics for delivery and the postpartum period.

Step one: get into remission before you conceive

The ACG summary of the consensus identifies clinical and endoscopic remission 3 to 6 months before conception as the most important factor for maternal and fetal health. Active disease at conception is the main driver of problems such as preterm birth and low birth weight.

If your IBD has been quiet for months, you are in a good position. If you have had recent symptoms, it is worth finding out why before you try to conceive. That usually means a conversation about:

• Objective testing. Symptoms alone can mislead. Blood tests, stool inflammatory markers and sometimes a colonoscopy or flexible sigmoidoscopy show whether inflammation is truly controlled. We explain these tools in our guide on how to monitor IBD with noninvasive, guideline-aligned steps.
• Medication review. Some drugs are fine to continue, and others need a planned stop or switch ahead of time.
• Nutrition. Iron, folate, vitamin B12 and vitamin D levels deserve checking, especially with small bowel Crohn’s, prior resection or a flare history. Your OB will usually start a prenatal vitamin with folic acid.
• Smoking. If you smoke, quitting helps both your IBD (particularly Crohn’s) and your pregnancy.

If you are not planning a pregnancy yet but could become pregnant, it is still smart to ask your GI which of your medications would need adjusting. Pregnancies are not always scheduled.

IBD medications and pregnancy

The fear that any IBD drug will harm the baby is common and understandable. Experts quoted by the ACG call this belief a dangerous misconception, because stopping stable therapy and having a flare is a bigger threat to mother and baby than the medications themselves.

The table below summarizes the general picture from the ACG’s review of the 2025 consensus. It is not a prescription list. Your dose, timing and drug choice depend on your disease and history.

Two things stand out. First, the newest oral small-molecule drugs have far less human pregnancy data than biologics, which is why planning matters so much if you take one. Second, the same summary notes that guidance on anti-interleukin-23 therapy has become clearer: the Global Consensus Statement, as described in the search summary of the published paper, advises continuing it through pregnancy.

Biologics during pregnancy

Biologics are the group readers ask about most. The consensus supports continuing them through pregnancy rather than stopping them at a set week. Medscape’s report quotes the lead author noting that North America has long recommended continuing through the third trimester, and that Europe has only recently moved that way. Your GI may still adjust the timing of an infusion or injection based on your drug and your delivery date, so do not self-adjust.

The same Medscape report says the new guidance also finds no harm from giving live vaccines to infants exposed to biologics in the womb, which overturns older advice to wait. Talk to your pediatrician about your baby’s vaccine schedule and tell them which drug you took.

Steroids

Steroids can control a flare quickly, but the PIANO registry data linked steroid use during pregnancy to worse infant outcomes in the ACG summary. That is an argument for keeping the disease controlled with maintenance therapy so you do not need rescue steroids, not for avoiding treatment of a flare when one happens.

What about ulcerative colitis specifically?

Everything above applies to both Crohn’s disease and ulcerative colitis. A few practical notes for ulcerative colitis:

• Mesalamine is a common maintenance therapy and is generally continued.
• Flares in the rectum and left colon can often be monitored with stool tests and, if needed, a limited exam such as flexible sigmoidoscopy, which avoids the full bowel prep of a colonoscopy.
• If you are in remission and on a stable regimen, the plan is usually to stay the course.

For background on the condition and treatment steps, see our pages on what ulcerative colitis is and on ulcerative colitis management steps. If you have Crohn’s, our overview of Crohn’s disease key facts and care pathways is a good starting point. Perianal disease needs extra planning for delivery, and our article on perianal Crohn’s care explains why.

During pregnancy: monitoring and warning signs

A pregnancy with IBD is monitored more closely than average. A typical approach looks like this:

• Regular GI follow-up each trimester, or more often if you have symptoms.
• Non-invasive monitoring such as blood work and fecal calprotectin to separate IBD inflammation from normal pregnancy changes like constipation and reflux.
• Endoscopy only when needed. If a flare is severe and the result would change management, a flexible sigmoidoscopy can be done during pregnancy with your OB’s input. Do not postpone or accept one without talking to your doctors.
• Nutrition checks for anemia and vitamin levels.

Pregnancy itself brings constipation, heartburn and nausea. They can blur the picture, so it helps to know how to handle the everyday ones. Our guide on why constipation deserves management covers risks and options, and you should ask your OB or GI before taking any over-the-counter product while pregnant.

Gentle movement can help with stress and bowel function when your doctors approve it. One resource on yoga during pregnancy, trimester by trimester is written in Portuguese but outlines how practice can change as pregnancy progresses.

When to call your doctor

Call your gastroenterologist the same day if you notice:

• Blood in your stool, or a clear increase in bloody stools
• Diarrhea more than your usual pattern, especially at night
• Abdominal pain that is new, severe or worsening
• Fever, or inability to keep fluids down
• Signs of dehydration such as dizziness or very dark urine

Call your OB or go to the emergency room for severe pain, heavy vaginal bleeding, fever with abdominal pain, or reduced baby movement later in pregnancy. If you are unsure which doctor to call, call either one. They are meant to be a team.

Delivery and the postpartum months

Most women with IBD can deliver vaginally. Your OB may suggest a cesarean in specific situations, such as active perianal Crohn’s disease or a history of an ileal pouch. Decide this in advance with both doctors rather than at the last moment.

After the baby arrives, the risk of a flare does not vanish. Keep your maintenance therapy going and book your postpartum GI visit before you leave the hospital.

Breastfeeding

The ACG summary states that breastfeeding is encouraged and not linked to disease exacerbation. Most medications, including biologics and 5-ASAs, are considered safe during lactation. JAK inhibitors and S1P receptor modulators are generally advised against because of limited safety data. If you took one of these before pregnancy and want to restart it, ask your GI whether you should wait or choose a different drug while nursing.

For a general reader-friendly overview of how medicines pass into breast milk, one pharmacy resource offers a guide to medications during breastfeeding and when they are safe, though it is in Slovenian and is not specific to IBD. Always check any drug, including over-the-counter ones and supplements, with your GI or pediatrician.

Our perspective

When a patient with IBD asks about pregnancy, we want the first conversation to happen before the positive test, not after. In our experience of IBD care, the most avoidable problems come from two places: stopping a working medication out of fear, and trying to conceive while the disease is still active.

Our approach is to treat pregnancy planning as part of long-term IBD care. We look at how well your disease is controlled, confirm that with objective testing, review your medications against current guidelines and write a plan you can share with your obstetrician. Dr. Meet Parikh is a board-certified, fellowship-trained gastroenterologist, and he speaks English, Gujarati, Hindi and Spanish, so patients and their families can talk through these decisions in the language they are most comfortable in.

If you are reading this with a flare under way, or already pregnant and unsure about your medication, please do not wait for a routine appointment. Reach out, and do not stop your treatment before speaking to a physician.

— Precision Digestive Health

Plan your IBD care with us

If you live in or near South Plainfield, NJ and are thinking about pregnancy, we can help you check that your IBD is controlled, review your treatment and coordinate with your obstetrician. Learn more about IBD care for Crohn’s disease and ulcerative colitis, or see all of our gastroenterology services and request an appointment.

A preconception checklist

Bring this list to your next GI visit:

1. What is my current disease activity, and how do we know? Do I need stool, blood or endoscopic confirmation?
2. Has it been in remission for 3 to 6 months?
3. Are all my current medications compatible with conception and pregnancy? Which need a planned stop, and when?
4. Which of my vitamin and iron levels should we check?
5. Who will manage a flare if it happens during pregnancy, and how quickly can I be seen?
6. What is the plan for the third trimester, delivery and breastfeeding?
7. Who will tell my OB, and can they speak directly?

Writing the answers down is useful, because pregnancy appointments can move fast.

FAQ

Can you have a healthy pregnancy with IBD?

Yes, most women do. The Crohn’s & Colitis Foundation states that healthy pregnancies and infants are possible, although the risk of complications is somewhat higher than average. Remission at conception and a coordinated GI and OB team give you the best odds.

Are biologics safe during pregnancy?

The 2025 consensus supports continuing most biologics, including anti-TNF, anti-integrin and anti-interleukin drugs, through pregnancy, as summarized by the ACG. Timing of the last pre-delivery dose can vary by drug, so your GI will set that plan. Do not stop on your own.

Does ulcerative colitis get worse during pregnancy?

It depends largely on how active it is at conception. Disease in remission tends to stay quieter than disease that is active when pregnancy begins, which is why the guidelines stress reaching remission first. If symptoms return, call your gastroenterologist promptly.

Which IBD medications should be stopped before pregnancy?

Methotrexate must be stopped at least 3 months before conception, and JAK inhibitors and S1P receptor modulators are typically stopped 4 to 12 weeks ahead depending on the drug, according to the ACG summary. Ask your GI about timing and what will replace them.

Can I breastfeed if I have IBD?

Yes. Breastfeeding is encouraged and most IBD drugs, including biologics and 5-ASAs, are compatible. Ask your GI about JAK inhibitors and S1P modulators, which are generally avoided while nursing.

Sources

• Pregnancy and IBD, Crohn’s & Colitis Foundation
• Updates on the Safety of Using Newer IBD Medications during Pregnancy, Crohn’s & Colitis Foundation
• What to expect when expecting with IBD, American College of Gastroenterology
• Achieve IBD Remission Before Pregnancy, American College of Gastroenterology
• Global Consensus Statement on the Management of Pregnancy in Inflammatory Bowel Disease, PubMed
• New Guidelines for Pregnancy and IBD Aim to Quell Fears, Medscape

Recommended

• What Is IBD: A Clear Medical Guide for Adults
• IBD Colorectal Cancer Risk: Clinician Checklist for Patients
• How to Monitor IBD: Noninvasive, Guideline-Aligned Steps
• Ulcerative Colitis Management Steps: 2026 Guide