No, You Don't Need to Dilute Your Pumped Milk After Drinking Alcohol

The idea that women need to "pump and dump" their breastmilk after drinking alcohol has long been disputed by science. But now, moms are diluting their milk with previously pumped breastmilk from when they didn't have a drink. Here's why "pumping and diluting" is also unnecessary.

breastmilk bottles with mom feeding in background
Photo: Evso/Shutterstock

Among the many superhuman powers women seem to assume after becoming mothers, the ability to create liquid gold—a.k.a. breastmilk—is among the most revered. That's why the idea of pouring this precious commodity down the drain is unthinkable, even if it is supposedly tainted with alcohol.

The truth is, you don't need to ditch breastmilk if you drank alcohol in moderation. According to the Centers for Disease Control and Prevention, says one standard alcoholic drink per day (12 ounces of 5% beer, 8 ounces of 7% malt liquor; 5 ounces of 12% wine; or 1.5 ounces of 40% (80 proof) liquor) is not known to be harmful to the baby. The CDC advises moms to wait at least two hours after a single drink before nursing, but does not suggest that moms who had an alcoholic beverage should stop breastfeeding.

"In general, if you are sober enough to drive, then you are sober enough to breastfeed," says New York-based lactation consultant Leigh Anne O'Connor. Timing and food consumption aren't the only factors to take into account when deciding if your milk is safe for baby. O'Connor also recommends considering details such as the age of the baby, the mother's metabolism, and exactly how much she's had to drink.

Still, the CDC says that if a mother decides to express or pump milk within two hours of consuming one alcoholic beverage, she may choose to discard the expressed milk. Moms looking for other options are turning to friends and social media for advice. Enter the idea of "pumping and diluting," an alternative to the practice of pumping and dumping that has women diluting their breastmilk with previously pumped, alcohol-free breastmilk—as opposed to dumping it down the drain.

What Does it Mean to 'Pump and Dilute'

It's hard to trace the origin of this practice, but Emily Bernard, a lactation consultant and founder of Before and After Baby breastfeeding support service, says it may have started in online forums. "The thought of blending pumped 'clean' breastmilk with breastmilk that is pumped and contains any substance, including alcohol, is one of those items that has caught wave in a lot of online moms groups," she says. "Sadly, it is not based in any type of science. Many moms also feel that pumping reduces the amount of alcohol within their breastmilk when in reality time is what does."

According to the U.S. National Library of Medicine's Toxicology Data Network, the highest alcohol levels in milk can be found a half hour to an hour after consuming alcohol, although food can delay the peak levels.

Is it Safe to Pump and Dilute?

Gladys Vallespir Ellett, the nurse coordinator for lactation services at NYU Langone, suggests steering clear of diluting altogether. "Because there are no recommendations regarding dilution of breast milk with pumped breast milk, it is not a practice that I would recommend," she says. "Rather than place restrictions and discourage women who are breastfeeding, I believe it is important for a woman to understand the recommendations so she can make decisions that are safe and that meet her desire to enjoy an occasional alcoholic drink."

That may be easier said than done, as recommendations vary between different organizations. Guidelines for how much a mom can safely drink vary between the CDC and the American Academy of Pediatrics. And online forums are a free-for-all that would make any mama's head spin. But Ellett notes that nursing right after one to two drinks can negatively impact an infant's ability to transfer milk, increase agitation, and cause sleep disturbances.

Ultimately, the act of pumping and diluting breastmilk may just be an unnecessarily complicated step for a potentially inebriated mother—especially if she's still attempting to feed her baby with the hybrid milk. "The danger to dilution is there is no way to measure how much alcohol is in the breast milk versus what it is being mixed with," Bernard says.

Bottom line: If you're not comfortable breastfeeding your baby after drinking, it's better to feed them either previously pumped milk or formula—or to ask someone else to do it for you. Only "pump and dump" if you're experiencing discomfort.

"The idea is to not get drunk," O'Connor says. "There are risks to caring for a baby while impaired, beyond alcohol in breastmilk—which metabolizes out of milk as it does out of blood. Generally speaking, a breastfeeding parent can enjoy the occasional drink without pumping and dumping."

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