A 29-year-old woman was charged on July 30 after a newborn baby boy was found in a bin in Tai Keng Gardens near Upper Paya Lebar Road on July 27.
The Indonesian woman was charged with exposure and abandonment of a child below 12 years old.
She is allegedly the infant's mother.
She is accused of committing the offence at around 5pm on Monday.
The woman was arrested on Wednesday.
She cannot be named due to a gag order to protect the child's identity.
The woman's bail was set at S$20,000 and her case has been adjourned to Aug. 13.
If convicted of the offence, she can be jailed for up to seven years and fined.
What happened?
A family in the area heard sounds coming from the recycling bin.
Unsure what it was, and thinking it might be a dog or cat, they did not open the lid initially.
A resident, who is the father-in-law of the person who heard the baby, then lifted the lid and spotted the infant wrapped in a towel and placed inside paper bags.
The police were called.
The family then carried the baby out of the bin and an ambulance arrived at the scene minutes later.
The baby was then rushed to KK Women's and Children's Hospital.
Police had earlier said he had no visible injuries and his condition was stable.
The police said in a statement after the woman's arrest: "Through extensive ground investigations and with the aid of images from CCTV footage provided by residents, officers from the Ang Mo Kio Police Division established the identity of the woman, who is believed to have abandoned the baby."
"The police would like to express our appreciation to the members of the community who provided valuable information which aided investigations and contributed to the arrest."
Officers are also looking into the identity of the baby's father.
Top photo by witness