Why Does My Baby Feed Better on One Breast Than the Other? An OT's Perspective

If you've noticed that your baby breastfeeds beautifully on one side but struggles on the other, you're not imagining it—and you're certainly not alone.

This is one of the most common concerns I hear from parents. While differences in milk flow or letdown can occasionally play a role, it's equally important to consider how your baby's body is moving and functioning during feeds.

As a pediatric occupational therapist, I look beyond the latch to understand how a baby's body, movement patterns, positioning, and regulation may be influencing feeding.

Let's explore some of the reasons your baby may prefer one breast over the other.

Is It Normal for a Baby to Prefer One Breast?

Some babies naturally show a mild preference for one side, and there isn't always cause for concern.

However, if your baby consistently cries, refuses one breast, has difficulty latching on one side, or feeds much more efficiently on one breast than the other, it's worth taking a closer look at what might be contributing.

1. Body Tension, Head Preference, or Torticollis

One of the most common reasons I see babies prefer one breast is because feeding on one side simply feels easier for their body.

If your baby has increased body tension, a strong head preference, or torticollis (tightness in the neck muscles), turning their head one direction may feel much more comfortable than the other. Since breastfeeding requires babies to position their head and body differently on each breast, these movement patterns can make one side significantly easier.

You may also notice your baby:

• Always looking to one side

• Arching during feeds

• Feeling stiff when you pick them up

• Disliking tummy time

• Developing a flat spot on one side of their head

  
  

These are all clues that your baby's body may be influencing feeding.

2. Positioning

Sometimes a small adjustment in positioning can make a big difference.

Babies rely on their entire body—not just their mouth—to feed effectively. If they aren't well supported or positioned comfortably, maintaining a deep latch can become more challenging.

An occupational therapist can help identify positioning strategies that support your baby's unique movement patterns.

3. Oral Motor Coordination

Breastfeeding requires babies to coordinate sucking, swallowing, breathing, jaw movements, tongue movements, posture, and regulation all at the same time.

If your baby has difficulty coordinating these skills, they may naturally prefer the side that feels easier for them.

4. Oral Ties

For some babies, oral ties may contribute to feeding preferences.

Restricted tongue mobility can make it more difficult to maintain a comfortable latch, and babies sometimes compensate by preferring the side that requires less effort.

It's important to remember that not every baby with an oral tie experiences feeding difficulties, and not every feeding challenge is caused by an oral tie. Looking at the whole baby helps determine what may be contributing.

When Should I Be Concerned?

Consider reaching out for support if your baby:

• Refuses one breast completely

• Cries every time they're positioned on one side

• Frequently loses their latch

• Clicks while feeding

• Takes a very long time to feed

• Is not gaining weight appropriately

• Seems uncomfortable during feeds

  
  

You don't have to wait until feeding becomes extremely stressful before asking questions.

How Can Occupational Therapy Help?

At Baby Steps OT, I take a whole-body approach to infant feeding.

During an evaluation, I assess much more than your baby's latch. I look at:

• Body tension and movement patterns

• Head and neck mobility

• Oral motor skills

• Positioning during feeding

• Regulation and state organization

• Muscle tone

• Developmental skills

• Sensory processing

  
  

Understanding how these pieces work together allows me to create an individualized plan that supports both your baby and your feeding goals.

Taking Things One Step at a Time

If your baby feeds better on one breast than the other, know that there's often an underlying reason—and it's not because you're doing anything wrong. By looking at the whole baby—not just the latch—we can better understand what's contributing to the challenge and create a plan that supports both you and your baby.

If you're concerned about your baby's feeding, trust your instincts. Early support can make a meaningful difference, and you don't have to navigate it alone.

At Baby Steps OT, I'm here to help your baby move, feed, and thrive—one step at a time.