Police released photographs Thursday of a newborn girl, found abandoned the day before outside a North Philadelphia day-care center, in an effort to locate her mother.

The infant - her umbilical cord still attached - was found in a box in front of the Rainbow Day Care Center, in the 2600 block of West Huntingdon Street, about 10 a.m. by a church employee who was doing some cleaning work in the block.

The 51/2-pound baby, just five hours old, was taken to St. Christopher's Hospital for Children, where doctors determined that she was in good condition.

Police said she was wrapped in a red-and-white, houndstooth-patterned blanket, an adult-size brown woman's sweater, a black bathrobe with polka dots, and a large peach-colored towel.

Investigators searched the neighborhood and reviewed surveillance video but found no clues to the mother's identity.

Authorities ask that anyone with information call the police Special Victims Unit at 215-685-3251.

Pennsylvania has a baby "safe haven" law that allows parents to leave unharmed babies up to 28 days old at any hospital.

Contact staff writer Robert Moran at 215-854-5983 or bmoran@phillynews.com, or follow @RobertMoran215 on Twitter.