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The kids aren’t alright.

City agencies that address childhood developmental problems saw referrals plunge during the height of the coronavirus pandemic, according to a sobering new study.

Advocates for Children of New York found an 82 percent drop in the number of cases that were brought to the attention of the city’s Early Intervention program between March and April 2020.

“As a result, thousands of young children with developmental delays or disabilities missed the chance for intervention at the time it is most effective,” the agency said in a statement Friday.

The group estimated that roughly 3,000 to 6,000 kids “fell off the radar” after city agencies and schools shuttered as the COVID-19 crisis unfolded.

Some of the drop in activity, AJC said, may have stemmed from parents delaying doctor visits that would have revealed developmental complications.

“Infants and toddlers cannot afford to wait for critically important Early Intervention services,” said Kim Sweet, AFC’s executive director. “The state and city need to take quick action to ensure young children with developmental delays and disabilities get the services they need right away.”

The organization warned that belated treatment could worsen these conditions and result in the need for more intensive interventions down the line.

AFC noted that many families who were already receiving services from EI programs stopped doing so amid the coronavirus upheaval.

Some found remote treatment for their young children untenable or ineffective and ultimately abandoned the program.

For others, remote offerings were “logistically impossible for some working parents,” according to AFC.

The group said it was now doubly imperative to connect vulnerable city kids to developmental services.

AFC called for new outreach programs, make-up services, and increased funding.