A mother and her infant child suffered minor injuries Wednesday when their vehicle collided with a car driven by a woman whom police suspect was driving drunk.

South Portland police Sgt. Adam Howard said officers charged Marguerite Mason, 75, of South Portland with operating under the influence.

Mason was not arrested at the crash scene, at Q and Market streets, but a blood alcohol test was done at the hospital and she was issued a summons.

Howard said the collision occurred around 4:15 p.m. after Mason ran a stop sign. The car driven by the baby’s mother hit Mason, causing Mason’s vehicle to land on its side.

All three people were taken to the hospital, but none of their injuries was considered to be serious.