There is a lot of breastfeeding advice online and unfortunately, not all of it is accurate or evidence-based.

As an IBCLC, I spend a huge portion of my time helping families sort through myths, outdated advice, and social media misinformation that can make feeding feel far more stressful than it needs to be.

Let’s break down some of the most common myths I hear in practice.

1. “Your Baby Is Always More Effective Than Your Pump”

Not always.

Many babies are very effective at milk removal — but not every baby is.

Some babies struggle with:

• Tongue ties or oral restrictions

• Prematurity

• Weak suck strength

• Sleepiness

• Poor latch mechanics

• Neurological or medical differences

• Inefficient transfer

At the same time, some pumps are incredibly effective when:

• Properly fitted

• Using appropriate settings

• Paired with the correct flange size

• Used consistently

There are absolutely situations where a pump removes milk more effectively than a baby can.

Milk transfer should be assessed individually — not assumed.

2. “Your Areola Should Fit in the Flange Like It Does in Baby’s Mouth”

This is one of the biggest pumping myths online right now. Your baby’s latch and your flange fit are completely different mechanics.

Those are two very different mechanics.

During breastfeeding:

• Babies compress and vacuum the breast dynamically

• A deep latch involves a wide opening of the baby’s mouth, taking in more breast tissue

• The areola helps create a seal and stabilize tissue

• The nipple elongates deeply into the oral cavity toward the junction of the hard and soft palate

During pumping:

• The pump relies primarily on vacuum mechanics

• The nipple should move relatively freely within the tunnel

• The flange tunnel should not pull in excessive breast tissue

• Excessive areolar edema/swelling can reduce comfort and sometimes impair milk flow

3. “You’ll End Up With Low Supply If You Use a Wearable Pump”

Wearables are tools — not inherently supply killers.

Some people respond beautifully to wearable pumps, while others do not.

Milk removal depends on:

• Individual anatomy

• Pump settings

• Frequency of milk removal

• Flange fit

• Breast storage capacity

• Elasticity of tissue

• Pump responsiveness

For some parents, wearables are the reason they are able to continue pumping long-term because they increase consistency and reduce stress.

The important question is: “Is milk being effectively removed for your body?”

Not: “Is this pump wearable or wall-based?”

4. “You Should Add 4 mm to Your Measured Flange Size”

I’m sure you’ve heard the universal “+4 mm rule.”

Flange fitting is individualized.

Some people need:

• Their exact measured size

• +1–2 mm

• Smaller than expected sizing

• Different sizing or shaping depending on the pump brand

What matters most is:

• Comfortable pumping

• Effective milk removal

• Minimal rubbing or swelling

• Nipple movement without excessive areola draw

Blindly adding 4 mm often leaves people in flanges that are far too large…IF they were measured correctly in the first place. 

5. “Your Baby Just Likes One Breast Better”

Sometimes babies appear to prefer one side — but usually there’s a reason.

Possible causes include:

• Faster or slower flow

• Neck tightness or torticollis

• Breast anatomy differences

• Oversupply or undersupply on one side

• Previous feeding difficulties

• Positional discomfort

• Ear infections or reflux

• Oral motor dysfunction

A true random “favorite breast” is less common than people think.

If a baby consistently refuses one side, it’s worth looking deeper with an IBCLC and/or infant feeding specialist.

6. “Every Person Can Produce Enough Milk for Their Baby”

This myth creates enormous guilt and a culture of “just try harder,” which is NOT helpful.

While many people can establish a full supply, not everyone can exclusively produce enough milk due to:

• Insufficient glandular tissue (IGT)

• Hormonal or endocrine conditions

• Breast surgery history

• Retained placenta

• Severe blood loss

• Certain medications

• Genetic factors

• Chronic illness

• Pregnancy complications

Needing supplementation is not a failure.

Feeding goals should support both:

• Infant growth

• Parent well-being

Breastfeeding support should never shame families, no matter their choices or abilities/wishes to breastfeed.

7. “Just Use Your Pump From Your Last Baby–It’ll Be Fine!”

Sometimes yes — sometimes no.

It depends on:

• The pump type

• The motor lifespan

• How old the pump is 

• Hours previously used

• Manufacturer recommendations

Pump motors weaken over time, and decreased suction can impact milk removal and supply maintenance. Between babies, we generally recommend moms to purchase a new pump. If you’re not sure which one, meet with an IBCLC to talk about your goals before your baby gets here.

Replacement timing varies widely between models.

Also important:

• Tubing

• Valves

• Membranes

• Duckbills

• Backflow protectors

…all wear down and affect performance.

8. “If Breastfeeding Hurts, You Have D-MER”

Dysphoric Milk Ejection Reflex (D-MER) is not nipple pain.

D-MER is a sudden emotional response that occurs right before milk letdown, often described as:

• Dread

• Sadness

• Anxiety

• Emptiness

• Irritability

It is thought to be related to rapid dopamine shifts during milk ejection.

Pain with breastfeeding is more commonly related to:

• Latch issues

• Nipple trauma

• Vasospasm

• Infection

• Pump injury

• Oral restrictions

• Positioning problems

D-MER is real. And so is nipple pain. We want to make sure we’re treating the right thing. See an IBCLC to tease out your discomfort.

9. “Breastfeeding Should Always Hurt at First — You’ll Get Used to It”

Some initial tenderness can happen due to hormone changes.

But ongoing pain is not something parents should simply endure.

Pain is information.

Persistent pain may indicate:

• Shallow latch

• Oral restrictions

• Nipple damage

• Incorrect positioning

• Infection

• Vasospasm

• Oversupply issues

• Pump trauma

Early support matters.

The goal is not:

“Survive until your nipples toughen up.”

The goal is effective, comfortable feeding.

10. “Nipple Confusion Is a Thing”

Research suggests babies are more likely experiencing flow preference or feeding ease/preference rather than literal “confusion.”

Babies may prefer:

• Faster flow

• Less effort

• Different oral mechanics

• More immediate milk transfer

Bottle feeding and breastfeeding use different motor patterns, but many babies transition between them very successfully with supportive feeding strategies.

This is why positioning, flow rate, and latch support matter far more than fear-based messaging around bottles.

REMEMBER:

Breastfeeding advice should be individualized, evidence-informed, and compassionate.

What works beautifully for one parent-baby dyad may not work for another.

If something feels painful, confusing, stressful, or “off,” you deserve support that looks deeper than internet myths and one-size-fits-all advice.

Feeding support should empower families — not shame them.

Talk with an IBCLC if you need more help with your feeding journey!