The police said Petrasanta met the child's mother, Babelyn Petrasanta, through social network Facebook.
The suspect identified himself as a relative.
On Sunday, he reportedly visited Babelyn's home and took the two-year-old child while she was cooking and her husband was not around.
He then demanded for P250,000 in exchange for the child, to be paid via a money remittance service.
When Babelyn reported the incident to the Laguna police, they used the address given to said remittance service to trace the whereabouts of the suspect.
Petrasanta is now facing a complaint for Kidnapping and Failure to Return Minor.