Police share results of latest tests in "Baby Doe" investigation

BOSTON -- Massachusetts investigators have received the results of another round of scientific testing that may help them identify the young girl whose remains were found in a trash bag by an island in Boston Harbor.

The search for the identity of the little girl, otherwise known as "Baby Doe," has been ongoing since her body was found on June 25. Investigators have tested her DNA, as well as posted compute generated images on social media, billboards and television -- to no avail.

Massachusetts State Police say that the latest tests compare residual oxygen isotopes in human hair and teeth with known levels in drinking water and could help them pinpoint where the girl lived.

Preliminary results suggest the child may have spent time in New England but also other locations across the U.S.

In a statement to CBS Boston, State Police say that scientists have also "not yet compared the biological evidence with drinking water samples in other countries." As a result, investigators are not able to definitively draw any specific conclusions.

Last month, investigators tested pollen samples from the clothing the child was found in. Experts believe that the pollen was from trees specific to the greater Boston area, Jake Wark, a spokesman for Suffolk County District Attorney Dan Conley, told 48 Hours' Crimesider.

Officials say the girl was found inside a trash bag with a Zebra print blanket, wearing polka dot leggings, close to the shoreline of Deer Island.

The child was estimated to be 4 years old with brown eyes and brown hair, weighed around 30 pounds and stood about 3-and-a-half feet tall, according to CBS Boston.

State and local police have reportedly received about 150 unique leads to her identity, but none has led to an identification.

Anyone with information can text the word GIRL and their tip to 67283 or call police at 617-396-5655.