WASHINGTON — The head of the government’s fight against the Zika virus said that “we are now essentially out of money” and warned that the country is “about to see a bunch of kids born with microcephaly” in the coming months.

Friday’s warning from Centers for Disease Control and Prevention Director Thomas Frieden came as lawmakers start to sort out a stopgap government funding bill that is being targeted to also carry long-delayed money to battle Zika.

Zika is spreading more widely in the U.S. and can not only cause microcephaly — in which babies are born with grave brain defects — but other problems that the country will face for decades. And 671 pregnant women in the states and Washington, D.C., have the virus, leading to the birth of 17 babies with microcephaly so far.

Frieden said funding delays have slowed long-term studies of the disease and production of new tests for it. “We haven’t been able to get a running start” on a long-term battle against Zika, he said.

Frieden added that “we don’t like to see” the use of pesticides such as Friday morning’s spraying of naled, in Miami Beach. But, he said, new technologies for the application of such toxic chemicals are safe for humans. The two localized mosquito-borne outbreaks in Miami are “quite difficult to control,” Frieden said, adding that the type of mosquitoes that spread Zika “are the cockroach of mosquitoes.”

President Barack Obama in February requested $1.9 billion to fight Zika, but Republicans controlling Congress acted slowly on the request. A Capitol Hill fight this summer stalled the Zika aid. Republicans attached restrictions on any of the money going to affiliates of Planned Parenthood in Puerto Rico. Democrats objected and blocked the $1.1 billion measure.