A SUBURBAN Melbourne mum who began sleeping weekly with her daughter’s 12-year-old boyfriend — eventually falling pregnant to him — has been jailed for six years.

The woman — who cannot be named because she now has a child the boy fathered — began abusing him several years ago when she was in her mid-30s and he was just 12.

The abuse continued for several years and ended after the woman gave birth to the boy’s child.

County Court judge Jane Patrick said the woman’s behaviour was an appalling breach of trust driven by a desire to fulfil her own emotional and physical needs.

“You failed to recognise that your feelings for the complainant were completely inappropriate,” Judge Patrick said.

The boy, who became a father when just a teenager, has since struggled to cope with the responsibility.

“You made (his adolescence) much more difficult for this child,” Judge Patrick said.

The woman and the victim began spending time together after having trouble at school.

At one point, her husband warned her about her inappropriate behaviour with the boy.

“She was looking like she could be a sexual abuser,” he is alleged to have said as their marriage was falling apart.

The woman repeatedly denied any impropriety, but finally confessed after police moved to take DNA samples from the baby.

Judge Patrick jailed the woman for six years, ordering her to serve at least three years and six months before being eligible for parole.