A JUDGE yesterday sent a disturbed woman who killed her baby to a mental hospital for three months after being assured she would receive care and supervision following her release. Mr Justice Michael Wong had wanted to impose a probation order in addition to the hospital order but was told in the High Court last Thursday that the law did not allow him to do this. Yesterday he said reports from doctors indicated that Wong Sau-kuen, 34, would receive support after her release from Siu Lam Psychiatric Centre. The mother, who pleaded guilty to infanticide, smothered her three-month-old son with bedclothes at a time when she was feeling depressed, helpless and frustrated. Mr Justice Wong told her: 'The doctors are firmly of the view that you need intensive in-house treatment for your illness. I am sure you want to be completely cured.' Since 1978 the woman has suffered from a condition called bi-polar affective disorder, which causes extreme swings in emotion. Wong had given birth to the child only 11 days after being released from a psychiatric hospital, where she was treated for a manic relapse of her condition.