Why There's No Need to Dilute Pumped Milk After Drinking

Some breastfeeding parents are diluting their breast milk with previously pumped breast milk after drinking alcohol. Here's why "pumping and diluting" is unnecessary.

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

Among the many superhuman powers new parents seem to assume after giving birth, the ability to create liquid gold (aka breast milk) is among the most revered. That's why the idea of pouring this precious commodity down the drain is unthinkable, even if it is potentially tainted with alcohol. So, some people have turned to diluting pumped milk after drinking alcohol instead.

But the truth is that you don't need to ditch or dilute breast milk if you drank alcohol, as long as you drank in moderation. According to the Centers for Disease Control and Prevention (CDC), a lactating parent consuming 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% liquor) is not known to be harmful to a nursing baby.

Rather than dumping or diluting pumped breast milk, the CDC advises breastfeeding parents to simply wait at least two hours after a single drink before nursing again. The CDC does not suggest that parents who consume an alcoholic beverage stop breastfeeding. Learn more about why you don't need to dilute your pumped breast milk after drinking alcohol—and what to do instead.

When Can You Breastfeed Again After Drinking Alcohol?

At any given time, the amount of alcohol in your breast milk parallels the amount of alcohol in your bloodstream. Therefore, people can generally tune in to how they feel to know if their milk is safe to feed. Feeling tipsy? You'll want to wait longer. If you feel totally normal, breastfeeding should be safe.

For people who want to be more cautious, or who may have a higher alcohol tolerance, you can safely feed if you wait two hours after your last standard drink.

"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, IBCLC. Timing and food consumption aren't the only factors to take into account when deciding if your milk is safe for your baby. O'Connor also recommends considering details such as your baby's age, your metabolism, and exactly how much you've had to drink.

What It Means to 'Pump and Dilute'

But what if you just drank, and then you pump or express the breast milk while your blood alcohol levels are still high? The CDC says that if you express or pump milk within two hours of consuming one alcoholic beverage, you should discard the expressed milk. Parents 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," in which breast milk pumped after drinking is diluted with previously pumped, alcohol-free breast milk—as opposed to dumping it down the drain.

It's hard to trace the origin of this practice, but Emily Bernard, IBCLC a lactation consultant and founder of Before and After Baby, says it may have started in online forums.

"The thought of blending pumped 'clean' breast milk with breast milk 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 breast milk when in reality, time is what does."

According to the CDC, 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, RN, IBCLC, the nurse coordinator for lactation services at NYU Langone, suggests steering clear of diluting breast milk 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," she adds.

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.

"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.

"The idea is to not get drunk," O'Connor says. "There are risks to caring for a baby while impaired, beyond alcohol in breast milk—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."

The bottom line is that if you'd prefer your infant get no alcohol exposure, it's better to feed them with either previously pumped milk or formula, or wait until your own blood alcohol level is low before you nurse. "Pumping and diluting" is not an evidence-based practice and is not advised.

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