An evil mother murdered her newborn baby girl by poisoning her with drain cleaner then hurling her from a third floor balcony into a bin.

The tragic infant was found by neighbours wrapped in black bags in a communal rubbish bin outside a block of flats in Nonthaburi, central Thailand, on July 23.

She was rushed to hospital but tragically succumbed to her severe internal injuries a few days later.

Officers checked CCTV footage which showed a black package being hurled from a third floor ledge.

Police arrested the mother, named only as, Aom, 18, and her boyfriend named as, Jay, 23, last Tuesday (30/07) after they fled to a nearby property.

The couple were taken on a crime re-enactment at the scene where the mother dropped a black package from the balcony to show how she threw the tot.

Aom admitted murdering the infant by pouring drain cleaner in her mouth. She told police she did not know she was pregnant and ''panicked'' after giving birth unexpectedly - and wanted to hide it from her boyfriend.

She said: "I went into the toilet after I felt a squeeze around my lower abdomen area. The baby arrived after that and I was panicking.

"I did not want my boyfriend to know about it. I decided to pour the drain cleaner all over the baby's face and into its mouth then thrown it away. I then cleaned the blood in the toilet after that."

Aom's boyfriend denied any involvement but was also remanded in custody by police who claimed not to believe his version of events.

The boyfriend said: "She just ordered me to buy her a sanitary napkins then leave her alone on that day.

"After I came back the room has been cleaned but I did not notice anything suspicious but my girlfriend's fatigue."

Police said they traced the mother after checking CCTV which pointed them to the room. The couple had left but blood stains in the bathroom matched the mother's DNA.

The mother and her boyfriend, who is not the biological father, were detained and remanded in custody. The mother initially denied killing her baby but later confessed after being presented with DNA evidence and CCTV.

Police Colonel Pongjak Preechakarunpong said: ''Sadly the baby girl died and the charges were made more serious, from attempting to kill her baby to murder.

''Both of the suspects have been denied bail. The mother admitted all charges but her boyfriend denies helping her. However, we will also charge him as from the evidence, we believe he was involved.''