Can a Formula-Fed Baby Truly ‘Thrive’?

If not, why do we suggest they can?

The Curious Case of “Thriving” on Formula: A Dive into Science and Psychology

If I say that formula feeding is associated with higher risks of certain health issues, the response is almost automatic:

“But babies thrive on formula!”

I see it all over social media. And I understand why. “Thrive” is such a warm, hopeful word. It evokes a rosy-cheeked, energetic baby hitting every milestone with vigor. It feels affirming. Reassuring. And, it means mom is giving the best to her baby.

But here’s the uncomfortable truth:

“Thrive” is a superlative.

It doesn’t just mean “doing okay” or “growing adequately.” It implies flourishing at the highest possible level - the optimal outcome nature designed for our species.

Breastfeeding is that superlative.
It is the biological baseline, fine-tuned over millions of years of evolution to deliver precisely what a human infant’s body and brain need for the best possible short- and long-term health.

Formula, by contrast, is a substitute, but in no way an equivalent.

What the Science Actually Shows

Major research confirms that formula use is associated with:

• Higher risks of infections (respiratory, gastrointestinal, otitis media)

• Poorer immune system development

• Less favorable metabolic programming

• Increased chances of overweight, type 2 diabetes, and other chronic conditions later in life

  So when we casually say a formula-fed baby is “thriving,” we are applying a superlative to outcomes that, according to the evidence, fall short of the biological optimum.

It’s not that formula fed babies aren’t growing and developing in many measurable ways - most do.
But calling it “thriving” stretches the word beyond scientific accuracy.
Adequate growth is not the same as optimal flourishing.

The Problem with Superlatives: There’s Nowhere Higher to Go

Here’s the subtle but powerful trap: once you call formula-fed babies “thriving,” you’ve used the highest possible word. There is no language left to describe anything better.

By saying they “thrive,” you’re effectively declaring that these babies are in perfect health - which can only mean they are just as healthy as breastfed babies. If there’s no higher position above “thrive,” then breastfeeding cannot be meaningfully better. In one casual phrase, an equivalency is created: breastmilk and formula are placed on the same level, or worse, the science that shows breastfeeding’s advantages is cleverly erased.

This linguistic sleight-of-hand benefits the formula industry. It flattens the hierarchy that nature created and turns the suboptimal into the optimal. And yes - the formula industry has spent decades shaping this exact narrative through marketing that portrays formula as modern, scientific, and just as good (sometimes even better) for busy, loving moms.

Why This Distinction Feels So Hard to Make

I’ll be honest: it feels genuinely sad - and actually mean - to point this out.

I know how much love, exhaustion, and hope are wrapped up in 'my baby is thriving on formula’. No one wants to hear that the choice they made (often under difficult circumstances) didn’t deliver the absolute best possible start. The last thing I want is to add to the crushing load of parental guilt.

Yet I also worry that if we don’t curate our language carefully, we inadvertently promote formula as fully equivalent. Every time “thrive on formula” goes unchallenged in conversations, ads, or social media, it shifts the baseline. It makes the suboptimal sound superlative. It softens the science.

To make matters worse, most women who end up formula-feeding didn’t want to formula feed but the system failed them with:

• Short maternity leaves

• Inadequate lactation support

• Workplace barriers

• Marketing that frames formula as modern and equivalent (or even superior)

Many are simply doing the best they can with the information and resources available.

The Psychology Behind the Word

That’s why the psychology behind “thriving” is so powerful. Reaching for that word often serves as emotional protection - a way to resolve the cognitive dissonance that arises when knowledge (“breastmilk is optimal”) collides with reality (“I’m using formula”).

Psychologists have studied this for decades. Leon Festinger described cognitive dissonance in the 1950s as the uncomfortable tension we feel when our actions don’t match our beliefs. To ease that tension, we often rationalize our choices by exaggerating the positives of the path we took.

Add in confirmation bias - we notice the giggles and chubby cheeks while not noticing any adverse health outcomes, and the statement “my baby is thriving” feels absolutely true.

I don’t enjoy saying that “thriving on formula” isn’t scientifically accurate. It can feel particularly harsh.

But silence or polite nodding feels like complicity in lowering the standard for what we consider normal or good enough for the next generation.

A Kinder, Clearer Path Forward

The kindest long-term approach is honesty paired with real systemic change:

• Better breastfeeding support from day one

• Longer paid maternity leave

• Workplace accommodations for pumping and nursing

• Transparent information on formula packaging listing health risk warnings

Breastmilk sets the superlative bar for human infant health. Formula doesn’t clear that bar.

But “thriving” belongs to the optimal.

Let’s reserve superlatives for what they truly describe. And let’s build a world where more mothers have genuine choice and support, so fewer have to reach for comforting language to ease the gap between what they hoped for and what was possible.

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What are your thoughts? Have you caught yourself using - or hesitating to correct - the word “thrive” in this context? How do we balance compassion with scientific clarity - especially when powerful industries benefit from blurred lines?

I’d love to hear your experiences in the comments, with the usual respect and nuance.

References

• Festinger, L. (1957). A Theory of Cognitive Dissonance. Stanford University Press.

• Victora, C. G., et al. (2016). Breastfeeding in the 21st century: Epidemiology, mechanisms, and lifelong effect. The Lancet.

• Horta, B. L., & Victora, C. G. (2013). Short-term effects of breastfeeding: A systematic review.

• Recent umbrella reviews and meta-analyses continue to support these directional findings.