An 8-month-old girl died nearly two weeks after her mother put her in the bathtub with the water running before leaving the room to do housework, and police have deemed her death a homicide, cops said Tuesday.

Amelia Belle Perez died at Montefiore Children’s Hospital on July 15, 12 days after bath time ended in tragedy, police said.

The tot’s 23-year-old mother placed her in the tub shortly before 6:30 p.m. July 3 inside their third-floor Murphy Houses apartment on Vyse Avenue near East 173rd Street in Crotona Park, sources said.

The woman told police she then left the room — with the water still running — to clean up around the apartment, and returned to find Amelia floating face-down in the bathtub, the sources said.

Amelia was rushed to St. Barnabas in critical condition, then transferred to Montefiore, but she ultimately could not be saved.

No arrests were immediately made and the Bronx Special Victims Child Abuse Squad is investigating, police said.