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Just as millions of families around the United States navigate sending their children back to school at an uncertain moment in the pandemic, the number of children admitted to the hospital with Covid-19 has risen to the highest levels reported to date. Nearly 30,000 of them entered hospitals in August.

Pediatric hospitalizations, driven by a record rise in coronavirus infections among children, have swelled across the country, overwhelming children’s hospitals and intensive care units in states like Louisiana and Texas.

Children remain markedly less likely than adults, especially older adults, to be hospitalized or die from Covid-19. But the growing number of children entering the hospital, however small compared with adults, should not be an afterthought, experts say, and should instead encourage communities to take on more efforts to protect their youngest residents.

“It should concern us all that hospitalizations — indicators of severe illness — are rising in the pediatric population, when there are a lot of steps we could take to prevent many of these hospitalizations,” said Jason L. Salemi, an epidemiologist at the University of South Florida, who tracks Covid-19 hospitalization data.

Public health officials and experts also caution that even small increases in the number of pediatric Covid-19 patients can put a major strain on pediatric hospitals and I.C.U.s, many of which are already overstretched with nursing shortages and an unusual summer surge of respiratory syncytial virus or R.S.V.

“The average pediatric I.C.U. in the U.S. has 12 beds,” said Dr. Christopher Carroll, a pediatric intensivist at Connecticut Children’s Medical Center. “In a system that small, even a few patients can quickly overrun the capacity. And there are fewer specialty trained pediatric clinicians to pick up the slack.”

The strain on hospital resources for children has prompted doctors and hospital executives to plead with adults to get vaccinated and return to mask wearing and social distancing to protect children, especially those under 12, who cannot yet be vaccinated.

“What really protects children are the interventions directed at the rest of society,” said Dr. Thomas Tsai, an assistant professor in the health policy department at Harvard University.

State-level vaccination coverage appears to be making a difference. States with the highest vaccination rates in the country have seen relatively flat pediatric hospital admissions for Covid-19 so far, while states with the lowest vaccine coverage have child hospital admissions that are around four times as high.

During the summer surge, the hospitalization rate was about 10 times as high in unvaccinated adolescents as in those who were vaccinated, according to a recent federal study. But data on hospitalizations among children of different ages is limited. A federal survey offers a breakdown for infants, children and adolescents, but it is based on 14 states, many of which have not experienced the worst of the Delta-led wave.

Scientists have said that there is not yet enough evidence to determine whether the Delta variant causes more severe disease in children than other variants.

There is no doubt, on the other hand, that pediatric hospitalizations have been pushed to new highs because Delta’s greater transmissibility has led to record levels of adult and pediatric cases of coronavirus across the country.

More child coronavirus cases — greater than 250,000 — were recorded in the past week than at any previous point in the pandemic, according to the most recent American Academy of Pediatrics survey of state data. More than five million children have tested positive for coronavirus since the pandemic’s start.

Public health experts caution that the magnitude of childhood infections matters even if most cases are mild, because scientists are still working to understand the long-term impacts of the disease, including “long Covid,” the presence of lingering neurological, physical or psychiatric symptoms after Covid infection.

“These are children whose development and futures may be compromised,” said Dr. James Versalovic, the interim pediatrician in chief at Texas Children’s Hospital. “The collective impact when we look ahead is significant.”

He added: “Children are our future adults.”