KEIZER, Ore. -- A toddler was found wandering alone in a Keizer neighborhood and police said his 19-year-old mom didn’t even know he was gone, according to police.

Sabrina Mills as shown in a police mug shot.

A neighbor found the two-year-old boy Sunday morning and called police.

Officers knocked on doors in the neighborhood and also used a reverse phone system to call area homes, asking for help tracking down the mother of the boy, who they described in detail.

But Keizer police captain John Teague said it was the knocking on doors that eventually led them to the boy's mother.

He said Sabrina Mills was located within a block of where the toddler was found. Teague said Mills told officers she had smoked marijuana the night before and didn’t realize her son was gone or wake up to answer the door. Police estimated the child was gone at least four hours before Mills was made aware of it.

She was arrested and booked into Marion County jail on charges of second-degree child neglect and endangering the welfare of a minor. Mills is from Dallas, Ore.

The boy was placed in protective custody by Department of Human Services.

Teague said Mills did not have a criminal history that he was aware of.