Justo Vazquez Espinosa, 38, of Williams Street, was charged with three counts of child molestation.
Espinosa is the boyfriend of a woman who babysat the three girls – ages 6, 7 and 9.
Grovetown Department of Public Safety Investigator Donovan Jones said Espinosa is accused of kissing and fondling all three girls several times last month.
One of the girls told her mother about the incidents, and the mother called police.
Espinosa was being held Thursday in the Columbia County Detention Center without bond, according to jail records.