A woman who stabbed her 13-month-old daughter – most likely in front of another of her children – was discharged from hospital less than a fortnight earlier, a court has heard.

The woman stabbed her youngest child to the throat with a kitchen knife in their Reservoir home on June 5, and afterwards telephoned her husband and said: "I think the baby is dead. I don't know what I have done."

The Supreme Court heard that the woman had been receiving treatment. Credit:Vince Caligiuri

The 28-year-old, who cannot be named so as to protect the identities of her other children, has pleaded guilty to infanticide, and the Supreme Court on Monday heard she received "episodic" treatment for mental-health problems for more than three years before she killed her daughter.

But she had also not taken her medication for schizophrenia for almost two years before the death, the court heard.