Father bottle-feeding infant at home, showing bonding and shared infant care through combination feeding

Breastfeeding and Formula Feeding: A Guide to Combination Feeding

Combination feeding—using both breastmilk and formula—can support mental health, flexibility, and your baby’s growth. Here's how to make it work.

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How to supplement breast milk and formula

In the world of new parenthood, few topics generate as much emotion and pressure as how we feed our babies. We're told that breastfeeding is best—but we're also sent home with formula samples. And then there's the recommendation to breastfeed for two years, while returning to work after six weeks. It's enough to make any mama feel steam coming out of her ears.


The reality of infant feeding rarely fits into neat categories. Many parents find themselves wondering how to supplement breast milk and formula in a way that works for their family's unique needs.


The Feeding Spectrum: Breaking Down the False Binary


Society often presents infant feeding as an either/or decision, but the truth is far more nuanced. Many parents need practical advice on how to supplement breast milk and formula effectively to create a sustainable feeding plan.

Today, let's explore a middle-ground approach that isn't often discussed: how to supplement breast milk and formula . With insights from Kelly Rutan , a certified postpartum doula and infant feeding specialist, we'll walk through how this flexible option can support both you and your baby.


Why Consider Learning How to Supplement Breast Milk and Formula?


There are countless reasons why understanding how to supplement breast milk and formula might benefit your family:

  • You're returning to work and pumping isn't producing enough milk
  • Your baby has weight gain concerns that need addressing
  • You want to share feeding responsibilities with a partner
  • You're experiencing nursing challenges but still want to provide some breast milk
  • Your mental health benefits from more flexibility in feeding schedules
  • You're dealing with low supply but don't want to give up breastfeeding entirely

"The most successful feeding plan is one that keeps both baby AND parent healthy and thriving," explains Rutan. "For many families, that means learning how to supplement breast milk and formula in a personalized way rather than adhering to rigid ideals."

mom paced bottle feed young infant

Common Approaches When Learning How to Supplement Breast Milk and Formula


The Nursing + Bottle Combo

Many parents who are figuring out how to supplement breast milk and formula choose to nurse when together with baby and provide formula when apart. This approach maintains the breastfeeding relationship while accommodating work schedules.


The "Best of Both Worlds" Method

Some parents exploring how to supplement breast milk and formula nurse at certain times of day (perhaps morning and evening) when milk supply is highest, while offering formula at other feedings.


The Gradual Transition

When weaning gradually, knowing how to supplement breast milk and formula allows you to slowly reduce breastfeeding sessions while maintaining nutrition for your little one.


Practical Tips for How to Supplement Breast Milk and Formula Successfully


Kelly Rutan recommends these strategies for parents learning how to supplement breast milk and formula :

  1. Start slow - Begin with small amounts of formula after nursing sessions to help baby adjust to the taste and digestion differences.

  2. Maintain breast stimulation - If maintaining breast milk production is a goal when you supplement with formula, remember the "supply and demand" principle.

  3. Find the right bottle - Some babies transitioning between breast and bottle do better with specific nipple shapes.

  4. Track feedings without obsession - Keep general notes on feeding times and amounts, but avoid becoming overwhelmed by precise measurements.

  5. Release the guilt - Remember that feeding your baby well—however that looks for your family—is what matters most when learning how to supplement breast milk and formula .

The Emotions When Learning How to Supplement Breast Milk and Formula


Let's be honest: deciding how to supplement breast milk and formula can bring up complex emotions. Many parents report feelings of:

  • Relief at sharing the feeding responsibility
  • Sadness about changes to the breastfeeding relationship
  • Gratitude for options that meet their baby's needs
  • Frustration at the judgment they perceive from others

"These mixed emotions are completely normal," Rutan assures us. "What's most important is acknowledging them while focusing on the beautiful connection that happens during feeding—regardless of what's in the bottle."


Finding Support for How to Supplement Breast Milk and Formula


Creating a sustainable feeding plan often requires support. When learning how to supplement breast milk and formula , consider:

  • Working with a lactation consultant who respects your combined feeding goals
  • Finding parent groups that embrace feeding diversity
  • Being selective about whose opinions you take to heart
  • Communicating your feeding plans clearly with caregivers and partners

Remember: You know your baby, your body, and your life circumstances better than anyone else when determining how to supplement breast milk and formula .


It's Your Adventure.


The reality is that infant feeding rarely follows a perfect plan. Bodies, circumstances, and babies themselves have ways of redirecting our carefully laid paths. The flexibility to adapt—including knowing how to supplement breast milk and formula when needed—can be the difference between struggling and thriving.


Want even more support navigating infant feeding choices? Our Infant Feeding course covers how to supplement breast milk and formula , and how to feel confident—no matter how you choose to feed your baby.


In this comprehensive program, you'll learn:

  • The science behind different feeding methods
  • Practical tips for how to supplement breast milk and formula successfully
  • How to overcome common challenges
  • Ways to preserve your breastfeeding relationship while supplementing
  • Strategies for feeling confident in your feeding choices

Remember, a nourished baby with a healthy, happy parent who understands how to supplement breast milk and formula when needed is what truly matters most.

Why Isn’t Supplementing with Formula Discussed More?

The simple answer: breastmilk often steals the spotlight. And for good reason—it’s biologically tailored and nutritionally ideal.

“Breastmilk is the biologically optimal food for human babies. It’s tailored to this little person; it’s a superhero!” — Kelly Rutan

But focusing solely on breastmilk can drown out nuanced conversations about real-life feeding challenges. Kelly emphasizes a whole-family approach: “We need to consider not just what’s best for the baby, but also what’s best for Mom’s mental health.”


Feeding doesn’t have to be an either/or decision. You can how to supplement breast milk and formula Many families thrive by embracing the benefits of both breastmilk and formula.


Consider how to supplement breast milk and formula

1. Medical Reasons

  • If your provider is concerned your baby isn’t getting enough from breastmilk alone, supplementation can be critical.
  • Formula can help you continue breastfeeding longer by relieving short-term challenges.

2. Mental Health and Flexibility

  • Exclusive breastfeeding can cause exhaustion, stress, or anxiety.
  • Supplementing may relieve pressure and support family wellbeing.

“The choice to supplement could simply be for the well-being of the entire family. It can make life with a newborn survivable.” — Kelly Rutan

Tips for how to supplement breast milk and formula


  • Define Your Goals:
    • Is formula a short-term solution or a long-term support for breastfeeding?
    • Think about what balance works best for your body and lifestyle.
  • Plan for Convenience:
    • Batch prepare bottles or pre-measure formula.
    • Use helpful tools like bottle sterilizers or warmers.
    • “It’s okay to run the dishwasher twice a day—hear this as permission!”


The Final Word on how to supplement breast milk and formula


Combination feeding might not be front-and-center in conversations with your OB or lactation consultant, but it’s a valid and empowering choice.


“Each family should feel empowered to make the choice that’s best for their family. Did you make the choice that’s best for your family today? Then good job. You’re doing great.” — Kelly Rutan


Looking for compassionate, expert-led support in feeding, parenting, and postpartum life? Explore our full course library—or go straight to our Infant Feeding course for deeper guidance.

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