Families with small children lined up beginning at 8 a.m. in a sparsely filled but buzzing auditorium, ready and relieved for COVID-19 vaccine appointments for their little ones at Children’s National Hospital’s research campus in Washington, D.C.

Seated in red chairs and surrounded by shiny red and white metallic balloons, small children and their parents sat with nurses, who administered the shots in front of an audience of masked spectators, largely press and hospital staff. 

Onlookers cooed and clapped as the kids got their shots, each child receiving a high-five, a sticker and a chance to pet Barney and Sprout, two facility dogs specially trained to help soothe children during their recovery.

Tuesday marked the first day COVID-19 vaccines were finally available to children under 5 following authorization last week when, after many delays, the Food and Drug Administration and the Centers for Disease Control and Prevention determined that the benefits of vaccination for children younger than 5 outweigh the risks. 

Dr. Sarah Schaffer DeRoo, a pediatrician at Children’s National, was among the first parents to bring their child for a shot. Her 7-month-old son, Hewitt, sat on his mother’s lap as he got the jab in front of cameras and family.

Although DeRoo was eager to get her son vaccinated, she’s heard a variety of thoughts from parents about getting their young kids vaccinated. 

“There are a number of parents I know who are elated (and) are going to be among the first in line to get their children vaccinated … but there’s a lot of hesitation around the pediatric vaccines,” she said. “And so I consider it my job to do my best to show them what are the benefits versus risks of the vaccine for them.”

Dr. Sarah Schaffer DeRoo, a pediatrician at Children’s National Hospital, sits her 7-month-old son, Hewitt, on her lap to get vaccinated at the hospital's research campus near the Takoma neighborhood of Washington, DC on Tuesday, June 21, 2022.

Every other age group of Americans has long had access to the vaccines, except babies younger than 6 months old, who can get protection from the parent’s vaccination during pregnancy.

In polling data from April, 18% of parents said they would vaccinate their young child right away, while 27% said they definitely wouldn’t and 38% said they’d wait and see.

Some parents say the vaccine trials conducted among young children were too small to satisfy their safety concerns, said Dr. Grant Paulsen, an infectious disease pediatrician and lead researcher for the children under 5 vaccine trials at Cincinnati Children’s Hospital Medical Center.

While adult trials included more than 70,000 people for both vaccines, only 5,000 children received at least one dose of the Moderna vaccine and 3,000 received Pfizer. Although health experts saw no signs of safety concerns in the clinical trials, they say it’s likely rare side effects could turn up as more children are vaccinated, just as with other common pediatric vaccines.

Because the two vaccines were studied separately, they cannot be compared directly.

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Moderna’s shots are given four weeks apart, meaning a child could have the fully intended protection against infection and severe disease by midsummer. The plan for Pfizer-BioNTech’s vaccine is to give two doses three weeks apart plus a third dose eight weeks later.

Health experts say Moderna may yet add a third dose to its vaccine regimen for children under 5. It’s unclear when the company will have data on that shot.