Four NYPD officers were walloped by a child’s Barbie bike that was tossed at them from a fifth-floor balcony in Brooklyn while they were busting a gunman early Sunday, officials said.

One officer suffered a gash to his head that required six staples and a stitch. Three others suffered a concussion, bruising to the head and a cut forearm, respectively.

Bryan Jiminez, 35, was charged with four counts of attempted murder of a police officer in the Crown Heights attack.

The cops had raced to 959 St. Mark’s Ave. at 2:05 a.m. in response to a report of shots fired, law-enforcement sources told the New York Post.

After nabbing suspected gunman Jeanick McVane, 21, the officers were allegedly set upon by two men — Nicholas John, 20, and Samuel Clark, 21 — who tried to keep McVane from getting hauled off, sources said.

A cop had Tasered one of the alleged interlopers when the pink-and-purple bicycle with training wheels came plummeting at them.

More cops arrived and traced the aerial assault to Apartment 5D, where they arrested Jiminez.