The mother of the baby boy left inside a Harlem Park Sunday night was charged with child endangerment.
Police say 18-year-old Kenyetta Rockwell of Staten Island also faces charges of reckless endangerment and filing a false report.
The boy is now with the Administration for Children's Services.
Rockwell and the baby's father both turned themselves into police.
She was arraigned on Tuesday and a judge set bail at $25,000. It is not clear if the father will be charged.
Sources say it appears Rockwell just couldn't handle taking care of the child anymore.
The baby appears to be between six and nine months old.
Michael Allen lives across the street and says he noticed the boy in his stroller from his apartment window.
When he saw the child, Allen flagged down nearby firefighters who took the child to a firehouse to get checked out.
Firefighters then took the baby to the hospital.
Allen says he can't imagine who would leave a baby out in the cold.
"I couldn't sleep last night, and I don't think I'll ever get a chance to sleep again comfortably. I know I'll get a chance to sleep, but not comfortably knowing that the child is homeless at this point," said Allen.
Allen tried to visit him Monday morning at Harlem Hospital, but officials wouldn't allow it.
The child has been nick named Baby Sunday.