Younger children face higher risk after water bead ingestion

Foreign body ingestion remains a common reason for pediatric poison center calls, and expanding water beads have become an increasing concern as their popularity has grown. Water beads are superabsorbent polymer crystals capable of expanding to many times their original size after exposure to liquid, creating the potential for gastrointestinal obstruction or aspiration following ingestion. Previous reports have documented a sharp increase in pediatric exposures over the past several years.^1,2

In a recent retrospective analysis of 6,135 pediatric water bead exposure calls reported to America's Poison Centers between 2010 and 2022, investigators found that 88% of children remained asymptomatic and no fatalities were reported. However, children younger than 2 years had approximately twice the odds of experiencing moderate or major clinical outcomes compared with older children, highlighting an age group that may warrant closer attention. Contemporary Pediatrics spoke with lead author Alexia M. Amaio, BS, a medical student at Robert Larner, MD College of Medicine, about the findings and their implications for pediatric practice.

Q&A

Contemporary Pediatrics: Your analysis of more than 6,000 poison center calls found that most water bead ingestions were asymptomatic, but children under 2 had roughly double the odds of moderate or major outcomes—what do you think accounts for that age-based difference?

Amaio: The age-based difference likely stems from a few things. Perhaps the most influential reason is simply anatomic - the diameter of the GI tract is smaller in younger children. As water beads grow larger after ingestion, the smaller diameter of the GI tract lends itself to obstruction. Additionally, there is likely a developmental component. Young children explore the world by putting things in their mouths, so there is a higher chance of kids under 2 putting the water beads in their mouths. This results in a higher number of cases, which inevitably lead to more complications given the anatomical differences in young children.

Contemporary Pediatrics: Given that 67% of exposures were managed outside of a health care facility, how should pediatricians counsel families on when home observation is appropriate versus when emergency evaluation is warranted?

Amaio: This is a great question. The first decision point on whether or not a child needs to be seen in the hospital is if they are symptomatic. Most kids who are asymptomatic do not experience serious health effects, so if kids have ingested expanding water beads and have no symptoms, they likely can be watched at home. Any symptoms such as severe abdominal pain, persistent nausea/vomiting, or other symptoms that would otherwise make a health provider concerned in any child should be sent to a healthcare facility. For mild symptoms, it is incredibly difficult to state from our data who needs to go to an emergency department or other healthcare setting and who does not, especially given it is difficult to identify water bead ingestion with tests such as X-rays until symptoms have progressed to more serious complications such as bowel obstruction. Ultimately it comes down to the age of the patient, their symptoms, if they have a known ingestion (and if so, how many beads were ingested, when, and if they were expanded), and a clinician’s judgement to determine who needs to seek further care.

Contemporary Pediatrics: Vomiting, abdominal pain, and coughing or choking were among the most commonly reported symptoms—are there specific warning signs that should heighten concern for gastrointestinal obstruction or aspiration?

Amaio: When looking at the data we have, there were 28 exposures that resulted in surgical intervention. When looking at these cases, the most common gastrointestinal symptoms were vomiting (17 cases), absent bowel sounds/ileus (2 cases), anorexia (2 cases), and constipation (4 cases). It’s difficult to say from this if there is any one symptom or even group of symptoms that should heighten concern; however, most of these cases had symptoms lasting longer than a few hours, and the average age of the exposure that required surgery was just over 3 years (median of 2 years). Some symptoms that were only reported in cases that required surgical intervention were absent bowel sounds/ileus, oliguria/anuria, and dehydration (2 cases each).

There were 17 cases admitted to critical care units, 117 cases admitted to non-critical care units, and 4 admitted to psychiatric hospitals. When examining the symptoms common in these cases, the most frequent are vomiting, constipation, anorexia, ileus/no bowel sounds, diarrhea, and abdominal pain, and they had symptoms lasting longer than a few hours.

Physicians should ultimately use their judgement about escalating care based on the patient’s symptoms and their duration and severity. It is important to keep in mind that younger kids are at higher risk, so the biggest takeaway is that there may be a lower threshold to refer younger kids, especially if they have symptoms lasting beyond a few hours. As always, it is still helpful to call the poison center, as they continue to work on updating clinical guidelines for exposures around the clock.

Contemporary Pediatrics: With exposures rising significantly in recent years, what role do you see for pediatricians in prevention, public education, and advocacy related to expanding water beads?

Amaio: Pediatricians can play a crucial role in the prevention of expanding water bead ingestions. A large part of my outpatient pediatrics clerkship was providing anticipatory education to parents, and part of that education often includes toys to be careful of with children, namely those with button batteries, small size, etc. I think that’s a perfect place to talk about what expanding water beads are, where they might be found (beyond children’s toys), and the dangers associated with them. Expanding water beads are frequently used as a sensory toy or as a fun addition to water play, and I think talking to parents or guardians about how kids should not be left alone with expanding water beads and how they are not appropriate for young children, like those under 2 who we know are at higher risk of more serious outcomes. I think extra caution can be shared with those with multiple children, as some young ingestions (like those in infants) likely occur as a result of older children sharing their toys.

On a larger scale, pediatricians and others who care for children are integral to informing advocacy and public policy. With expanding water beads, there is currently a proposed federal policy that seeks to limit the marketing and sale of expanding water beads to children by limiting their color, size, and changing packaging and sales. This bill, called the “Ban Water Beads Act” or “Esther’s Law”, named after a 10-month-old who died from sequelae of ingesting expanding water beads, was introduced into the Senate in November of 2023. Advocacy could involve contacting local representatives and advocating for “Esther’s Law” to be brought to a vote. Changes from the law will take time to go into effect, so I know that parent and caregiver education is the best way to prevent more ingestions and serious side effects of expanding water beads.