Is It Safe to Get Pregnant With Crohn's Disease?

For most people with Crohn's disease, getting pregnant is safe enough that current guidelines plan for it rather than advise against it. The risks that do exist (preterm birth, a smaller baby, a harder time conceiving) are driven mainly by active disease, so the single most useful thing is to be in documented remission before you try. Crohn's adds two questions that ulcerative colitis does not: active disease around the anus changes how you are likely to deliver, and previous bowel surgery can lower fertility and IVF success.

That is the short answer. The longer one matters because a lot of people with Crohn's are still told something much harsher. The thread behind this article is a woman in r/CrohnsDisease whose family doctor told her it was too risky to ever get pregnant; she conceived naturally weeks later and was then managed by a gastroenterologist, an obstetrician and a haematologist. Her story is not evidence of anything on its own. But the advice she was given does not match what the 2025 global consensus on pregnancy in IBD says, and the gap between the two is what this article is about. What happens after the birth, if you breastfeed, is covered in Crohn's disease and breastfeeding.

If you have ulcerative colitis, the sibling posts on planning pregnancy with UC and a UC flare during pregnancy cover your condition. This one stays with Crohn's.

"Too risky to ever get pregnant": what the guidelines actually say

No current guideline we read tells people with Crohn's disease to avoid pregnancy. The most recent and broadest is the 2025 global consensus statement on pregnancy in IBD, written by an international group of IBD and pregnancy specialists (Mahadevan 2025). It recommends preconception counselling for everyone with IBD, asks for documented remission before elective conception, and says IBD pregnancies "should be considered as high risk for complications". The point of that last statement is to get people more monitoring. It is not a recommendation against having children.

For transparency: the consensus was funded by the Leona M. and Harry B. Helmsley Charitable Trust, and many of its authors declare consulting fees, speaker fees or research grants from companies that make IBD biologics. That matters most for its medication statements, which are covered briefly below.

So where does "too risky" come from? Partly from old beliefs that have outlived the evidence. In a survey of 145 women with IBD, 36% believed all IBD medication harms unborn children, and 30% of those without children since diagnosis had considered not having any. Views like "pregnant women should avoid all IBD drugs" went with lower scores on a validated pregnancy-knowledge questionnaire (Selinger 2013). An older US survey found voluntary childlessness of 18% in women with Crohn's, against 6.2% in the general population (Marri 2007). The authors of that survey thought education and background explained much of the gap, so it is not proof that people were scared off. But it shows how many people with Crohn's end up without the children they might have had.

There are real reasons a clinician might say "not yet", and they are different from "never":

• Your Crohn's is active right now, or you are on steroids to control it.
• You are taking methotrexate, which must be stopped before conception.
• You have had very recent surgery, a new fistula, or a stricture that has not been assessed.
• You are significantly underweight or malnourished, especially after extensive small bowel disease or surgery.

Each of those is a reason to plan, treat and wait. If you were told "never" without one of them being named, it is reasonable to ask for a second opinion from a gastroenterologist with an IBD and pregnancy interest, or a maternal-fetal medicine specialist. The questions to ask your doctor about Crohn's post has a section you can adapt.

What does "high risk" actually mean if I have Crohn's?

It mostly means you get more appointments and more scans. The consensus trimester plan includes a gastroenterology visit or check-in in each trimester, blood tests to monitor the IBD, a nutrition assessment, referral to a maternal-fetal medicine specialist where available, and a discussion of delivery mode in the third trimester (Mahadevan 2025).

People in r/CrohnsDisease describe the same thing from the patient's side. In a thread from a 21-year-old worried about being a mum one day, several replies from mothers with Crohn's describe "high risk" as extra growth scans because of the risk of a smaller baby, and one notes that being labelled high risk made extra testing easier to get. Another describes being labelled high risk for low birth weight and then delivering a baby over eight pounds. These are individual stories, not data, but they match what the label is for.

How much does Crohn's change the odds for the baby?

Crohn's raises the risk of preterm birth and low birth weight modestly, and most of the extra risk sits with active disease. The numbers below are the ones we could verify from papers we opened. Odds ratios tell you how much higher a risk is relative to another group; the absolute percentages, where available, tell you how often it actually happens.

Two things are worth taking from that table. First, the absolute numbers are small: in the French data, about 92 in 100 pregnancies with IBD did not end in preterm birth. Second, almost every study that separates active from quiet disease finds the risk concentrated in active disease. That is the lever you have some control over.

The Swedish biopsy study is interesting for Crohn's in particular. It used colon biopsies taken in the year before pregnancy, and inflammation seen under the microscope predicted preterm birth in UC but not in Crohn's (Mårild 2022). One plausible reason is that a colonic biopsy can miss Crohn's that lives in the small bowel. That is a hypothesis, not something the study tested, but it is one more reason Crohn's remission is usually confirmed with more than one kind of test.

Why active disease is the variable that matters most

Conceiving while Crohn's is active roughly doubles the chance of active disease during the pregnancy. A meta-analysis of six Crohn's studies (590 patients) found a risk ratio of 2.0 for active disease during pregnancy in people who conceived with active Crohn's compared with those in remission (Abhyankar 2013). The authors rated almost all included studies as low quality, so the exact number is soft, but the direction has held up in later work.

Active disease during pregnancy then feeds through to the baby. Across 28 studies, active IBD was linked with higher odds of low birth weight, preterm birth, small-for-gestational-age babies, spontaneous abortion and stillbirth than inactive IBD, and the Crohn's subgroup showed more preterm birth, small babies and spontaneous abortion (Kim 2021). The abstract does not give the Crohn's-only odds ratios, so we have not invented them.

How long in remission before trying?

The consensus suggests ideally 3 to 6 months of remission before conception, confirmed with tests rather than symptoms alone. It defines documented remission as steroid-free clinical remission plus objective markers: a faecal calprotectin under 150, a normal CRP, and endoscopy or imaging such as intestinal ultrasound or MR enterography depending on your disease (Mahadevan 2025). Reddit threads often mention being told 6 or 12 months; that is a stricter version of the same idea, and your IBD team sets the actual target. The UC planning post walks through a year-before timeline that applies equally to Crohn's.

The "objective markers" part matters more in Crohn's than in UC. Small bowel Crohn's can cause few symptoms while still inflamed, and the symptom-score problem in Crohn's is that how you feel and what a scan shows often disagree. A symptom score is still useful as one input and a way to talk about the months before you try. The Harvey-Bradshaw Index is the one the consensus names for Crohn's activity in pregnancy studies.

If you get a calprotectin result back and want to understand the number, the calprotectin result explainer and the post on a high calprotectin with no symptoms cover what it can and cannot tell you.

Does pregnancy make Crohn's worse?

On average, no. The best prospective data come from a European study that followed 92 pregnant women with Crohn's through each trimester and six months after delivery, matched to non-pregnant women with Crohn's. There was no statistically significant difference in disease course between the two groups during pregnancy or postpartum. In the same study, pregnant women with UC were more likely to relapse than non-pregnant women with UC, which is one of the clearest places the two diseases part ways (Pedersen 2013). Longer disease duration and being on immunosuppressants were the risk factors for activity in pregnant women with Crohn's.

You may have heard the "rule of thirds" (a third better, a third the same, a third worse); it comes up repeatedly in the threads, often as something a GI or obstetrician said. The UC flare in pregnancy post traces where that rule comes from and why it does not fit UC; for Crohn's, the Pedersen result is a more direct answer.

One study points the other way and is worth knowing about with its caveat attached. In a large national inpatient database, pregnant women admitted to hospital with a Crohn's diagnosis had much higher odds of perianal abscess and fistulas involving the genital or urinary tract than non-pregnant women admitted with Crohn's (Hatch 2014a). That compares two groups who were both sick enough to be admitted, not pregnant women with Crohn's in general, so it cannot tell you how often these problems occur. It is a reason to report new perianal pain, swelling or discharge promptly during pregnancy, not a reason to fear it.

Several people in the threads also describe a flare in the weeks after giving birth. The postpartum period is a recognised second risk window; the UC flare post covers the postpartum evidence, and the breastfeeding post covers medicines and flare risk while nursing, most of which applies to Crohn's too.

Perianal Crohn's and how you give birth

This is the most Crohn's-specific question in the whole topic, and the evidence is thinner and more divided than most advice suggests. Perianal disease means fistulas, abscesses, fissures or narrowing around the anus. The consensus position is (Mahadevan 2025):

• Active perianal disease at the time of delivery: a caesarean is suggested (a conditional recommendation on very low-quality evidence).
• Current or past rectovaginal fistula: planned caesarean, because these fistulas are so hard to heal.
• Inactive perianal disease: the severity of past disease and past surgery should be discussed, and caesarean considered particularly if past disease was complex. It is less clear-cut.
• No perianal disease: decided on obstetric grounds, like anyone else.

The consensus also notes that the number of children you want matters, because more than three caesareans can bring their own complications, and that some people strongly want a vaginal birth and should be counselled rather than overruled.

Here is what the individual studies found, since they do not all agree:

The pattern is fairly consistent once you separate active from inactive disease. Active perianal disease at delivery is where vaginal birth seems to make things worse, and where the very high rate of severe tears in the US database sits. For inactive or past perianal disease, most of the newer studies did not find vaginal birth to be the problem; the strongest predictor of a postpartum perianal flare was having had perianal disease at all.

Be careful with one result in that table. In the 2024 Otero-Piñerio study, vaginal delivery looked protective (OR 0.19) and caesareans were followed by more perianal flares (11% vs 2%). That is almost certainly because people with worse perianal disease were steered towards caesareans in the first place, which is called confounding by indication. It does not mean a caesarean causes flares, and the authors still recommend caesarean for active perianal disease.

If you have perianal Crohn's and are thinking about pregnancy, the practical step is to get the perianal disease assessed and, ideally, quiet before you try, and to ask early whether a colorectal surgeon should be part of the delivery discussion. In an r/CrohnsDisease thread started by someone newly pregnant and newly diagnosed, one commenter described her doctors agreeing to avoid a caesarean if possible because strictures were her main concern, while noting that fistulas would have changed that calculus. That is the shape of a good conversation: your specific disease, not a blanket rule.

Previous bowel surgery: fertility, IVF and pregnancy

Past Crohn's surgery seems to matter more for getting pregnant than for carrying a pregnancy. In a Swedish national cohort of 27,331 women with IBD, fertility was lower in Crohn's than in matched women (hazard ratio 0.88), and disease severity, bowel resections and perianal disease in Crohn's were each linked with lower fertility (Druvefors 2021). A French referral study found women with prior abdominal surgery, colonic disease or perianal disease were less likely to have had children (Grouin 2015).

For IVF the effect looks larger. In a Danish nationwide study of 158 women with Crohn's having first-time assisted reproduction, the chance of a live birth within 18 months was not significantly lower overall (adjusted OR 0.58, 95% CI 0.32 to 1.03), but women with previous Crohn's surgery had an adjusted odds ratio of 0.29 compared with those without surgery (Friedman 2017). Previous UC surgery did not show the same effect. The likely mechanism is adhesions (scar tissue) around the fallopian tubes, though the study did not measure that directly. Note that the consensus also says IVF effectiveness after pelvic surgery for IBD is similar to women without IBD, citing different data, so the two positions are not fully settled.

For anyone with IBD, the consensus suggests a fertility specialist review if you are not pregnant after six months of timed intercourse, which matters more if surgery is part of your history.

Can Crohn's stop you from getting pregnant?

Rarely on its own, but fertility is a little lower on average, and the reasons are disputed. The Swedish figure above (HR 0.88) means women with Crohn's gave birth at a rate about 12% lower than matched women. That study also found women with IBD used contraception more than controls before and after diagnosis, and its authors thought some of the gap was people choosing to have fewer children (Druvefors 2021).

An earlier systematic review went further, concluding that the 17% to 44% reduction in fertility it found in women with Crohn's who had never had surgery was due to voluntary childlessness, with no evidence of a physical cause (Tavernier 2013). The 2025 consensus takes a different view, recommending counselling that active disease increases infertility risk and suggesting that IBD may reduce ovarian reserve (Mahadevan 2025). We could not reconcile those two positions; the most honest summary is that choice explains part of the gap, and active disease, surgery and perianal disease probably explain some of the rest.

Men with Crohn's ask this too. The UC planning post covers male fertility and paternal medicines, which are largely shared across IBD; methotrexate in men is something to raise with your team directly.

Weight, nutrition and the small bowel

Not gaining enough weight in pregnancy is more common with Crohn's, and it is linked with smaller and earlier babies. In a Norwegian mother-and-child cohort, 34.3% of mothers with Crohn's had inadequate gestational weight gain against 19.4% without IBD (adjusted OR 2.02), and inadequate gain in Crohn's went with a several-fold higher risk of a small-for-gestational-age baby (Bengtson 2017a). In a US pregnancy cohort of 559 mothers with Crohn's, inadequate weight gain predicted preterm birth (OR 2.5) and intrauterine growth restriction (OR 3.3) (Bengtson 2017b). Flares made inadequate weight gain more likely, so the two problems travel together.

The consensus recommends checking folate, iron, vitamin B12 and vitamin D before conception or early in pregnancy, referring to a dietitian if weight gain falls short, and referring anyone with extensive small bowel surgery. It also says a higher folic acid dose than usual may be needed with extensive small bowel disease or malabsorption; your team sets the dose. If you have had your terminal ileum removed or are already struggling to keep weight on, the post on gaining weight with Crohn's is a practical starting point to take to a dietitian.

One small discrepancy for anyone checking: the consensus quotes the Norwegian figures as 39% (OR 2.28) for Crohn's and 21% for mothers without IBD, while the paper's own abstract says 34.3% (aOR 2.02) and 19.4%. The consensus figure may be unadjusted or from a different table; we have used the abstract's numbers.

Medicines: the one firm stop

Methotrexate must be stopped before conception; most other Crohn's maintenance treatments continue through pregnancy under the 2025 consensus. Methotrexate can cause birth defects, and the consensus strongly recommends stopping it before conception. Its preconception table says at least 1 month beforehand, while its medication section says 1 to 3 months, so ask your team which they use (Mahadevan 2025). A dad in one thread said he and his wife waited a year because of his methotrexate, which is longer than either window but illustrates that it gets planned around.

For the rest, the consensus recommends continuing anti-TNF therapy throughout pregnancy and suggests continuing thiopurines, vedolizumab, ustekinumab, the anti-IL-23 drugs and 5-ASA. JAK inhibitors and S1P modulators have stop windows. The reasoning is the same as everywhere else in this article: uncontrolled disease is the bigger risk to the baby. The UC planning post has the drug-by-drug list.

This is where a lot of the bad advice in the threads lives. In the same "worried about being a mum" thread, one person was told to stop Remicade for six months before trying, and another commenter replied that it is typically not stopped for pregnancy. The consensus sides with the reply. But only your IBD team knows your drug levels and history, so do not stop, start or change anything on the strength of an article or a thread.

A worked example: two people asking the same question

These are composites, not real patients. They show how the same question gets different answers depending on the Crohn's details.

Person A is 31, with ileal Crohn's, one ileocaecal resection five years ago, and stable on an anti-TNF. Her symptom score has been low for a year, her calprotectin is under 150 and her CRP is normal. Following the consensus, she is in documented remission on a medicine that continues in pregnancy, so the main planning items are checking nutrition (B12 after an ileal resection, folate, iron, vitamin D), recording a baseline weight, and knowing that if she has not conceived after six months, her surgery history is a reason to see a fertility specialist promptly. Her delivery is decided on obstetric grounds, because she has no perianal disease.

Person B is 29, with colonic and perianal Crohn's, a seton in place for a fistula, and on methotrexate plus a biologic. She is not told "never". She is told "not yet": methotrexate needs stopping before conception, the perianal disease needs assessing and ideally controlling, and a colorectal surgeon should be involved in planning. If the fistula is rectovaginal, now or in the past, the consensus says she should plan a caesarean. If it settles and stays inactive, delivery mode becomes a shared decision.

Both can reasonably plan a pregnancy. The difference is the route and the timing.

What to track in the months before you try

The useful record is the one that shows your team you are in remission, not just that you feel fine. A short daily symptom score, stool frequency, any perianal pain or discharge, weight once a week, and every calprotectin, CRP and scan result with its date covers most of what the consensus asks for. The IBD symptom diary post has a field-by-field layout, including how to log steroid courses, which matters because remission must be steroid-free.

If you would rather not build that yourself, Clairop logs symptoms, bowel movements, medications and lab results and turns them into a one-page report for your GI visits; how it works shows what that report contains. A paper notebook works too.

Myths about Crohn's and pregnancy

"You can't get pregnant with Crohn's." In Sweden, women with Crohn's gave birth at a rate only modestly lower than matched women, and part of that gap may be choice. Active disease, surgery and perianal disease are what lower it further.

"You have to come off all your medication." The consensus says the opposite for most maintenance drugs. Methotrexate is the clear exception.

"Pregnancy will put your Crohn's into remission." Some people in the threads felt better while pregnant, and some flared. On average, pregnancy did not change the Crohn's course in the best prospective study.

"Crohn's means an automatic C-section." Only active perianal disease and rectovaginal fistulas push clearly towards caesarean. Without perianal disease, it is an obstetric decision.

"If you feel fine, you're in remission." Small bowel Crohn's can be active with few symptoms. Documented remission uses tests as well as how you feel.

When to see a doctor promptly

Contact your IBD team or obstetric unit promptly, and do not wait for the next routine appointment, if you are pregnant or trying and have:

• Blood in your stool, or more frequent or looser stools than your usual baseline for more than a few days.
• New or worsening pain, swelling, heat or discharge around the anus, or any air or stool passing from the vagina.
• Fever, persistent vomiting, cramping abdominal pain with bloating and inability to pass stool or gas (possible obstruction).
• Weight loss, or failing to gain weight as expected in pregnancy.
• Leg swelling or pain, chest pain or sudden breathlessness, since IBD raises the risk of blood clots in pregnancy and after birth.

Any severe abdominal pain, heavy bleeding or reduced baby movements in pregnancy needs urgent care the same day.

The honest bottom line

Crohn's disease makes pregnancy something to plan, not something to avoid. The risks to the baby are real but modest, and they cluster in active disease, which is why documented remission before conception is the centre of the guidance we read. Crohn's brings two extra questions that deserve specialist input: perianal disease, which shapes how you deliver, and previous surgery, which can make conceiving harder. If someone told you pregnancy was "too risky" without naming one of those specifics, the current evidence gives you good grounds to ask again.