Witnesses told police that city resident Natasha Rodney, who is eight months pregnant, was clutching a pole inside the crowded Bronx-bound No. 4 train when Michel Lee, 40, boarded at the Bowling Green station and bumped into her after 8 a.m.
The two began arguing when Rodney pushed Lee, of Staten Island, and knocked him to the floor, police said.
Lee immediately jumped to his feet and kicked the woman twice in the stomach, officials said.
Cops who responded to the scene took Lee to the Transit District 2 station house in the Canal St. station, where they charged him with felony assault, misdemeanor assault and felony reckless endangerment.
EMTs took Rodney, who was complaining of stomach pains, to Lower Manhattan Hospital. Both Rodney and her baby were given clean bills of health, police sources said.