HINGHAM, Mass. — Police have charged a 21-year-old woman with leaving a 2-month-old infant in her car for about 20 minutes while she had a morning drink at a bar.Police say the woman at first brought the infant into the Hingham bar with her just before 10 a.m. Thursday.She was refused service and left, but returned a few minutes without the child.An off-duty police officer became suspicious and called local police, who found the infant under a blanket in a car seat.