Sunny side up eggs with a runny yolk are not considered safe during pregnancy. The CDC and FoodSafety.gov both recommend that pregnant women eat eggs cooked until the yolk and white are firm, or use pasteurized eggs in any dish that won’t reach a safe internal temperature. A runny yolk means the egg hasn’t gotten hot enough to kill Salmonella bacteria, which poses real risks to both you and your baby.
Why Runny Yolks Are a Problem
Salmonella is the main concern with undercooked eggs. The bacteria can live inside the egg itself, not just on the shell, and it takes thorough cooking to eliminate it. Egg dishes need to reach an internal temperature of 160°F (71°C) to be safe. A sunny side up egg, where the yolk stays liquid and glossy, doesn’t come close to that threshold across the entire egg.
Pregnancy changes your immune system in ways that make food poisoning harder for your body to manage. If you do get sick, Salmonella typically causes fever, nausea, vomiting, stomach cramps, and diarrhea. Most people recover on their own, and pregnant women aren’t at a higher risk of catching it than anyone else. But in roughly 4% of cases, the bacteria enters the bloodstream, and that’s where the danger escalates. Bloodstream infection can lead to intrauterine sepsis, which directly threatens the pregnancy.
What Salmonella Can Do to a Pregnancy
Animal research on Salmonella Enteritidis, the strain most commonly found in eggs, paints a serious picture of what happens when infection reaches the uterus. In a controlled study, infection during late pregnancy led to premature labor in 40% of cases and pregnancy loss in 33%. Offspring from infected mothers weighed almost 50% less than those from healthy controls, a pattern consistent with fetal growth restriction. The mothers themselves often showed only mild symptoms like fatigue, meaning a severe pregnancy complication can develop even when the infection doesn’t feel particularly alarming.
These are animal-model numbers and the rates won’t translate directly to humans, but they illustrate why health agencies treat this risk seriously. Salmonella species can cross the placenta, infect the fetus directly, and trigger complications ranging from preterm labor to sepsis in the newborn.
How Likely Is a Bad Egg?
The actual odds of cracking open a contaminated egg are low. Studies of commercial eggs have found Salmonella prevalence rates around 5.5% on eggshells and 1.8% in the egg contents themselves. That means the vast majority of eggs you buy are perfectly fine. But “low risk” and “no risk” aren’t the same thing, and during pregnancy the consequences of hitting that unlucky percentage are far more severe than they would be otherwise. Cooking eggs fully eliminates the gamble entirely.
How to Eat Eggs Safely
You don’t need to avoid eggs during pregnancy. They’re one of the best food sources of choline, with about 125 milligrams per large egg. Choline is critical for your baby’s brain development, helping form neural connections and build cell membranes. Insufficient choline during pregnancy has been linked to neural tube defects like spina bifida and may contribute to long-term cognitive problems in children. So eating eggs is actively beneficial. You just need to cook them right.
The simplest rule: cook until both the white and yolk are firm. That rules out sunny side up, soft-boiled with a runny center, and poached eggs with liquid yolks. Safe options include:
- Hard-fried eggs: flip and cook until the yolk is solid
- Hard-boiled or hard-scrambled eggs
- Frittatas, quiches, and egg casseroles cooked to 160°F (or 165°F if they contain meat)
Also watch for hidden raw eggs in foods like homemade Caesar dressing, tiramisu, homemade eggnog, cookie dough, cake batter, hollandaise sauce, and eggs Benedict. If you want any of these, make sure they’re prepared with pasteurized eggs.
The Pasteurized Egg Workaround
Pasteurized shell eggs have been heat-treated just enough to kill bacteria without cooking the egg. They look and taste the same as regular eggs. If you really want a runny yolk, pasteurized eggs are the CDC-approved path to get there. They’re sold at most major grocery stores, usually labeled clearly on the carton. You can use them in any recipe that calls for raw or lightly cooked eggs without the Salmonella risk.
A Different Standard in the UK
If you’re reading advice from British sources, you’ll notice the NHS takes a more relaxed stance. In the UK, eggs stamped with the British Lion mark or produced under the Laid in Britain scheme are considered safe to eat runny or even raw during pregnancy. This is because the UK’s vaccination and testing programs for laying hens have driven Salmonella rates in these eggs extremely low. The NHS still advises cooking non-Lion-marked eggs thoroughly.
In the United States, no equivalent certification exists for standard grocery store eggs, which is why U.S. guidelines remain stricter. If you’re in the U.S. and want runny eggs, pasteurized eggs are your best option.
If You Already Ate Runny Eggs
If you’ve already had a sunny side up egg and you’re feeling fine, there’s no reason to panic. The statistical likelihood that any single egg carried Salmonella is small, and most exposures don’t result in illness. Salmonella symptoms typically appear within 12 to 72 hours of eating contaminated food. If you develop fever, diarrhea, vomiting, or stomach cramps in that window, contact your healthcare provider and let them know you ate undercooked eggs. Dehydration from vomiting and diarrhea can be particularly concerning during pregnancy, so getting fluids and medical guidance early matters.