The researchers analyzed nearly 30,000 cases where children under 6 had ingested foreign objects. They then estimated that more than 759,000 children had been evaluated in United States emergency departments for such ingestions during the two decades studied, and the number of estimated cases grew from more than 22,000 in 1995 to nearly 43,000 in 2015.

It was unclear how much of the increase could be attributed to improvements in case reporting over the years. But Dr. Orsagh-Yentis said she thought the rise was partly because of the proliferation of electronics with button batteries , which are found in a multitude of household items including thermometers, remote controls and toys.

As a whole, battery ingestions increased 150-fold during the study period, the researchers reported. Button batteries, which can be fatal if ingested, were found to be the most common type of battery that young children swallowed.

“They’re in everyone’s house, whether they realize it or not,” Dr. Orsagh-Yentis said.

When a battery is swallowed, it can trigger a series of chemical reactions that could result in burns, causing “significant tissue injury even within two hours,” according to the American Academy of Pediatrics, and potentially lead to perforation or hemorrhage.

The A.A.P. suggests giving two teaspoons of honey to children older than 1 year who have recently swallowed button batteries. Researchers have found that it can help protect the tissue near the battery and reduce injuries. But doctors warn not to delay medical treatment.