Police were called to the 6400 block of W. Bloomingdale Ave at around 1:35 p.m.
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The fetus was covered in a blanket as detectives worked the scene.
The circumstances are not yet clear.
Illinois's safe haven law allows parents to give up a newborn baby for adoption by leaving the baby with workers at a designated safe place with no questions asked, as long as the baby has not been hurt and is less than 30 days old. Those safe places are: hospitals, emergency care facilities, police stations and staffed fire stations.