Breastfeeding & Infant Gut Health

A mother holding her baby.

Could Infant Gut Health Be the Missing Piece?

When elimination diets aren’t enough, what we might be overlooking in our babies’ microbiome.

In my work sitting with new mothers (talking through spit-up patterns, diaper contents, colic symptoms, and endless dietary adjustments), a recurring theme has started to take shape. More and more, I find myself asking not just what is causing a baby’s discomfort, but why so many babies seem to be struggling in the first place.

The questions I ask now go deeper than feeding frequency or latch mechanics. I ask:

• How did your labor go?

• Did you receive antibiotics during pregnancy, during labor, or immediately after delivery?

  • A C-section, for example, routinely involves a prophylactic antibiotic dose, and we know that antibiotics can significantly disrupt gut health.

Our gut is where absorption happens. It affects the quality of our lives in ways we’re only beginning to understand.

The Infant Microbiome

Research on the microbiome has grown enormously in recent years, and the picture that

emerges is striking. Gut health has meaningful connections to autoimmune disorders, nutrition, brain fog, skin conditions, and allergies. The gut isn’t just a digestive organ. It seems to be a central regulator of overall health.

So why would our babies be any different? We know that bifidobacteria strains are essential for infant digestion. If a baby is lacking some of these key strains, digestion suffers, and the symptoms look a lot like what so many parents are describing. There is also growing evidence that COVID-19 disrupted gut microbiomes significantly in many people, potentially destroying beneficial strains and creating persistent imbalances. ( https://www.nature.com/articles/s41575-022-00698-4

https://www.nih.gov/news-events/nih-research-matters/covid-19-disrupts-gut-microbiome)

This, on top of our diets and on top of antibiotics, could create a very imbalanced gut microbiome for mom and baby. Skin-to-skin with mom, breastfeeding, probiotics, and fermented foods can help seed the gut with healthy microbes.

With this knowledge concerning how gut microbiomes affect our health and can be passed along to the infant's gut health, it is important to ask more questions and not go straight to dietary restrictions. I wonder sometimes if we are dealing less with food sensitivities and more with a foundational gut health issue that needs to be addressed and reseeded? Or is it best to tackle this with both initial dietary changes and probiotics?

Dairy Elimination Diets

There is plenty of supportive evidence from mothers that cutting back on dairy and other high-allergen foods in the first weeks can make a big difference for some babies. It is amazing to me how quickly a baby's skin can clear, their poops become less watery and mucousy, they become less gassy and fussy just by changing some of the foods and quantities of foods moms eat. Some will see the spit up all but disappear. Some babies may be on reflux medication, and once changes happen, baby stops having signs of reflux.

Dairy remains the most common dietary culprit when a breastfed or formula-fed baby shows signs of digestive distress, followed by soy, corn, eggs, gluten, beef, and pork. In some cases, temporary elimination is genuinely necessary, and it works. But when we remove all of these foods at once, we also eliminate many of the good fats and proteins that support milk supply, both in quantity and quality. Mothers come to me exhausted, dizzy from inadequate caloric intake, and worried that their milk is thinning. This is not a sustainable path for many families.

Myth vs. Fact: How Long Does Dairy Stay in Breastmilk?

Studies show that the average peak concentration of dairy proteins in breastmilk occurs around 1–4 hours after ingestion. A small study using highly accurate mass spectrometer ion intensity testing found that cow's milk protein peaked at 2 hours post-ingestion and was undetectable at 6 hours. LLLILA Lactation, LLC

Historically, the medical community has been telling mothers it takes 2-3 weeks for dairy to get out of the breastmilk. This simply isn't true. This is the amount of time that the baby's symptoms may fully resolve, not for the protein to leave the milk itself. These are two very different things. Telling a mother she needs to pump and dump for 2 weeks and give dairy-free formula is not the answer. This severely undermines the mother and makes life so much more difficult. She can continue to breastfeed throughout the elimination process.  LA Lactation, LLC

Probiotics for Babies: What to Expect During the Transition

Probiotics can cause initial fussiness in a baby as they shift the gut microbiome. It is important not to stop them too soon before the beneficial changes have a chance to take hold. What looks like a reaction may actually be a transition. This is worth discussing with your care team before stopping a probiotic early.

What Did Women Do Before?

I find myself asking this question often. A century ago, breastfeeding mothers weren’t

navigating extensive elimination diets. So what has changed? The honest answer is: a great deal. Our food supply has shifted dramatically. Preservatives, highly processed ingredients, fast food, and microwave-ready meals have displaced the whole foods and home-cooked meals that defined earlier generations’ diets.

I was raised in a kitchen that prioritized whole ingredients, and I tried to do the same for my

children, but I also understand how easy it is to reach for a protein bar, a frozen casserole, a prepackaged snack. These conveniences are everywhere, and their long-term effects on our microbiomes are still being studied. It may be time for many of us to return to the kitchen, at least in part. Not as a moral imperative, but as a practical strategy for gut health: for ourselves and for our babies.

Going Forward on the Path

When I think about how to help families in these complicated situations, my instinct is always toward simplicity. What is the easiest thing to do? What is the most direct route to a calmer baby and a more nourished mother? Sometimes that means a temporary dietary change. Sometimes it means exploring probiotics thoughtfully. Sometimes it means stepping back and looking at the whole picture (the birth history, the antibiotic exposure, the state of the mother’s own gut health) before deciding what to eliminate or add.

Each family is different. Each mother-and-baby pair deserves an individualized plan, not a

one-size-fits-all protocol.

Beyond Food: Could Oral Anatomy Be the Root Cause of Reflux?

It is definitely a multifaceted problem for many babies and families. It isn't always straightforward and requires weeks of investigation around diet, gut health, reflux, oral anatomy (recessed jaw, asymmetrical jaw, oral restrictions, and swallowing disorders can all play a role in reflux, choking, and difficulty breastfeeding and bottle feeding), swallowing, flow of milk, and more. Having a team help through this trying time can be essential to get answers and find a routine and schedule that works for each family.

Simplifying the Path

It is easy to feel overwhelmed about what to eat and how to cook while eliminating foods to see what upsets baby. There are several different methods. Some women choose to do the all-at-once method, and others prefer to do one at a time. Our team can work with you on meal planning, gut health strategies, and root-cause thinking to find a path that is sustainable and supportive for both you and your baby.

Breastfeeding is hard enough. You shouldn’t have to navigate this alone. And remember, sometimes it isn't the food we are eating but more about the way the baby is swallowing that is the root cause.

Call or message Gulf Coast Lactation today, and we will get you scheduled for an in-person or telehealth appointment. (In-home appointments are limited to availability and location) We also accept most major insurance plans.