Long before federal health officials declared an outbreak in August 2025, infants across the United States were falling gravely ill after consuming ByHeart formula — their suffering unrecognized as part of a pattern, their parents left without answers. The recall of all ByHeart products in November, following laboratory confirmation of botulism-causing bacteria in unopened cans, has forced a reckoning with what was missed and when. At the heart of this story is a tension as old as public health itself: the gap between the moment harm begins and the moment institutions are able to see it.
Earlier ByHeart botulism cases raise questions about outbreak timeline
Multiple infants hospitalized with potentially deadly botulism; affected babies experienced constipation, poor feeding, weakness, and lingering effects requiring intensive care treatment.
This cannot be a coincidence.
Mark
So we have at least five babies who got sick from ByHeart formula months before August, but health officials say they can't connect those cases to the current outbreak. How is that possible if the same bacteria is in the formula?
Mimi
The issue is timing and what counts as evidence. When those early cases happened—November 2024 through June—they were scattered, within the normal range for a rare disease, and there was no obvious common source. Botulism in babies usually comes from the environment or honey. The connection to formula wasn't apparent until many more cases clustered together starting in August, all involving the same brand and the same toxin type.
Luke
But that's circular reasoning, isn't it? They didn't suspect ByHeart because they didn't have enough cases to suspect ByHeart. Then when they got enough cases, they could confirm contamination. But the contamination was apparently there all along. Why shouldn't those earlier cases count?
Mimi
You're right to push on that. Food safety experts like Frank Yiannas are saying the same thing—if babies consumed ByHeart and were treated for botulism, they should be included. The CDC's position is that they're aware of the earlier cases but are focused on understanding the large surge. It's not that they're denying the connection; it's that they're saying the outbreak signal only became clear recently.
Mark
What's the practical problem with linking the old cases now?
Mimi
Time. Parents may not have kept lot numbers or empty cans. Months have passed. One test of an open can from spring didn't detect the bacterium. Without that documentation, it's harder to prove definitively that a baby's illness in March came from the same contaminated batch as one in September.
Luke
But that's a documentation problem, not a scientific one. The bacterium was in unopened cans. If a baby drank ByHeart in March and got botulism, and we now know ByHeart was contaminated, why is the burden on the parent to prove it? Shouldn't the company or the health system have records?
Mimi
That's the parents' argument exactly. Katie Connolly said she became obsessed with finding the cause. When the recall came, she wanted to know why March cases didn't trigger the same investigation that August cases did. She's asking for the data that would explain how her daughter got sick.
Mark
Is there any chance the contamination started later and the early cases were something else?
Luke
Possible, but unlikely given what we know. Six babies in California alone, treated for botulism between November and June, all fed ByHeart. That's not random. The real question is whether the contamination was present from the beginning or developed over time, and whether there are even more cases no one has connected yet.
Mimi
That's what keeps the parents up at night. Their babies are recovering, but they're left wondering if they're part of a larger pattern that wasn't recognized when it mattered most.
Der Puls
- At least five infants were hospitalized with botulism after consuming ByHeart formula between November 2024 and June 2025 — months before officials recognized any outbreak at all.
- A nationwide recall issued November 11 shattered the silence for families who had spent months searching for a cause, suddenly making the unthinkable feel inevitable.
- Health officials defend their timeline, arguing the epidemiological signal only became clear in August when cases clustered by region, toxin type, and brand — but outside experts say the earlier cases should be counted regardless.
- The practical barriers to justice are mounting: lot numbers are lost, cans have been discarded, and the longer investigators wait, the harder it becomes to link pre-August cases to the contamination.
- Affected mothers are demanding to be counted — not as statistical outliers, but as the earliest evidence of a failure that may run deeper than the official case count suggests.
Long before federal health officials declared an outbreak in August 2025, infants across the United States were falling gravely ill after consuming ByHeart formula — their suffering unrecognized as part of a pattern, their parents left without answers. The recall of all ByHeart products in November, following laboratory confirmation of botulism-causing bacteria in unopened cans, has forced a reckoning with what was missed and when. At the heart of this story is a tension as old as public health itself: the gap between the moment harm begins and the moment institutions are able to see it.
In March, Amy Mazziotti watched her five-month-old son Hank fall ill after drinking ByHeart formula. In April, Katie Connolly's eight-month-old daughter M.C. was hospitalized with the same rare disease. Neither mother knew what had caused the botulism infections. When ByHeart recalled all its formula nationwide on November 11, the pieces seemed to fit — but the official outbreak timeline told a different story.
California public health authorities confirmed that six infants in that state contracted botulism between November 2024 and June 2025, up to nine months before the surge that has now sickened at least 31 babies across 15 states. At the time, officials said there was insufficient evidence to point to a single source. Laboratory testing of unopened ByHeart formula has since revealed contamination with the bacterium that causes infant botulism — yet officials still say they cannot definitively connect the pre-August cases to the current outbreak.
Food safety lawyer Bill Marler, representing affected families, says at least five babies were treated for botulism after consuming ByHeart formula in late 2024 and early 2025. For months, their parents had no answers. Botulism in infants typically stems from environmental spores or contaminated honey — sources that seemed unrelated to their children's circumstances. Connolly, who had spent months searching for a cause, asked the question many parents are now asking: why did cases beginning in August trigger an investigation, but cases beginning in March did not?
Health officials offer an epidemiological explanation. CDC scientist Dr. Jennifer Cope noted that the signal only became apparent when cases clustered on the East Coast in August — involving a toxin type rarely seen in the region, striking very young infants, and disproportionately involving ByHeart, a brand accounting for less than one percent of formula sold nationally. Before this outbreak, no powdered infant formula in the United States had ever tested positive for the responsible bacterium. The earlier cases fell within expected ranges for a rare illness affecting fewer than 200 infants annually.
Outside experts are unconvinced by the distinction. Former FDA deputy commissioner Frank Yiannas said flatly that all cases involving ByHeart consumption and botulism treatment should be included in the outbreak investigation. The challenge now is practical — months have passed, lot numbers may be lost, and empty cans have been discarded. Both Mazziotti's and Connolly's babies are improving, though lingering effects remain. Both mothers say their children deserve to be counted. The deeper question — how many cases went unrecognized if the bacterium was present as early as November 2024 — remains unanswered.
In March, Amy Mazziotti's five-month-old son Hank fell ill after drinking ByHeart formula. Weeks later, in April, Katie Connolly's eight-month-old daughter M.C. was hospitalized with the same rare disease. Neither mother knew what had caused the botulism infections. They fed their babies what they believed was a safe product. Then, on November 11, ByHeart recalled all its formula nationwide, and suddenly the pieces seemed to fit.
But the timeline doesn't begin in August, when federal health officials say the outbreak started. California public health authorities confirmed late last week that six infants in that state contracted botulism between November 2024 and June 2025—up to nine months before the surge that has now sickened at least 31 babies across 15 states. At the time those earlier cases occurred, officials said there was insufficient evidence to point to a single source. Even now, they maintain they cannot definitively connect the pre-August cases to the current outbreak. Yet laboratory testing of unopened ByHeart formula has since revealed contamination with the bacterium that causes infant botulism.
According to Bill Marler, a Seattle food safety lawyer representing affected families, at least five babies were treated for botulism after consuming ByHeart formula in late 2024 and early 2025. Mazziotti described her son's illness in March. Connolly recounted how she had given her daughter the formula hoping it would help the baby sleep, only to watch her hospitalized in April. Marler says at least three additional cases predate the official outbreak window—one from December 2024, two from spring. For months, these parents had no answers. Botulism in infants typically stems from environmental spores or contaminated honey, sources that seemed unrelated to their children's circumstances.
When the recall came, Mazziotti's reaction was immediate: this could not be coincidence. Connolly, who had spent months obsessed with finding the cause, felt something else—a sense of being left behind. "What I want to know is why did the cases beginning in August flag an investigation, but the cases that began in March did not?" she asked.
Health officials offer an explanation rooted in epidemiology. Dr. Jennifer Cope, a CDC scientist leading the investigation, noted that the signal connecting ByHeart to botulism only became apparent in recent weeks. Before this outbreak, no powdered infant formula in the United States had tested positive for the bacterium responsible for the disease. The earlier cases fell within expected ranges for a rare illness that affects fewer than 200 infants annually. A test of an open can of formula from a sick baby in spring did not detect the bacterium. But beginning in August and continuing through October, cases clustered on the East Coast involving a toxin type rarely seen in that region, striking very young infants, and disproportionately involving ByHeart—a brand accounting for less than one percent of infant formula sold in the country. When a sample from a can fed to a sick infant finally tested positive, officials moved.
Yet the gap between the early cases and the August surge raises uncomfortable questions. Outside experts say the CDC should count all cases where babies consumed ByHeart and were treated for botulism as part of the same outbreak. Frank Yiannas, former deputy commissioner for food policy at the FDA, was direct: "Absolutely, yes, they should be included. Why wouldn't they be?" Sandra Eskin, chief executive of STOP Foodborne Illness, framed the human stakes plainly: parents fed their newborns a product they trusted was safe, and now they are managing hospitalization and serious illness.
Botulism causes constipation, poor feeding, weakness in the head and limbs, and other complications. Mazziotti's and Connolly's babies are improving, though lingering effects remain. Both mothers say their children deserve to be counted in this outbreak. Connolly is clear about what she needs: "We deserve to know the data that can help us understand how our babies got sick." The challenge, Cope acknowledged, is practical—months have passed, lot numbers may be lost, empty cans discarded. Linking older cases definitively to the contamination will be harder now. But the question lingers: if the bacterium was present in ByHeart formula as early as November 2024, how many other cases went unrecognized, and what does that mean for the true scope of this outbreak?
Bemerkenswerte Zitate
What I want to know is why did the cases beginning in August flag an investigation, but the cases that began in March did not?— Katie Connolly, mother of infected infant
Absolutely, yes, they should be included. Why wouldn't they be?— Frank Yiannas, former FDA deputy commissioner for food policy
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