Ampang Jaya district police chief Farouk Eshak said police were alerted by a security guard at the condominium at 2.20pm.

He said the preliminary investigation found that the boy, who is a foreigner, had followed his mother, who works as a part-time maid at one of the condominium units.

“The victim, who is the youngest of three siblings, was left sleeping alone by his 36-year-old mother in the living room of the unit. The woman then went down to the laundrette.

“The child is believed to have woken up and opened the sliding door before climbing onto a chair on the balcony,” he said in a statement today.

Farouk said at the time of the incident, the boy’s father was working in Petaling Jaya and a check found that the victim’s parents had lived in the country for the past five years.

He said the victim’s body was sent to Hospital Canselor Tuanku Muhriz Universiti Kebangsaan Malaysia for an autopsy, adding that no arrests had been made so far.

The case is being investigated under Section 31(1) of the Child Act 2001 (for neglect and exposure of children to danger), he added.