A 15-year-old girl, who gave birth to a baby in secret, threw her newborn from the third floor of an apartment in Sri Petaling, Kuala Lumpur, Sin Chew Daily reported.
It is learnt that the girl from Sabah gave birth to the baby girl on Thursday.
She disposed of the baby for fear that her family would find out.
It was reported that the local voluntary patrol team members found the body of the dead baby at about 11pm and called the police.
Police found the young mother in a unit on the third floor after checking each unit floor by floor.
The girl was a school dropout and it is believed that she had a relationship with an Indonesian man living nearby.
Police are investigating the case under Section 302 of the Penal Code for murder.