A 33-year-old Redwood City teacher has been arrested after DNA tests confirmed that a former student fathered her 2-year-old baby when he was 16-years-old.

Rebecca Boicelli (search) was arrested Thursday on three charges of lewd and lascivious acts with a minor and statutory rape, Redwood City police said. Boicelli faces up to five years in prison.

The Menlo Park woman is being held on $500,000 bail at the San Mateo County jail. She had worked as a substitute teacher at several schools in the Redwood City Elementary (search) School District.

Boicelli met the boy while teaching at the district's Opportunity School, when he was in middle school. The boy at the time was just 14.

Students have reported seeing the two together often. A custodian also told authorities he saw the pair kissing. And the boy's mother claimed Boicelli had given her son pornographic material.

Police began investigating Boicelli in March after another teacher reported odd behavior between her and the student.

The father is now 18-years-old and has since dropped out of school.

FOX News' Adam Housley and The Associated Press contributed to this report.