Police in Chicago charged three people in connection with the murder of a pregnant teenager whose unborn baby was taken from her womb after her death.

Police said Marlen Ochoa-Lopez, 19, was lured to the home of someone she knew on 23 April with the promise of free baby supplies, was instead strangled, and her baby cut from her womb.

Clarisa Figueroa, 46, and her daughter Desiree, 24, have been charged with first degree murder.

Piotr Bobak, 40, whom police described as Clarisa Figueroa's boyfriend, was charged with concealing the murder.

At a news conference, Chicago police chief Eddie Johnson called the crime "disgusting and thoroughly disturbing."

"I can't even pretend to imagine what that family is going through right now. They should be celebrating the birth of a young baby.

Instead, they're mourning the loss of the mother and possibly that young child," Johnson said.

Police allegedly discovered Ms Ochoa-Lopez's body hidden in a rubbish bin while serving a search warrant at the Figueroa's home on Tuesday night.

"Apparently, Miss Ochoa had bought other baby items from Clarisa, so they knew each other," deputy chief Brendan Deenihan said.

On the day of Ms Ochoa-Lopez's disappearance, Clarisa Figueroa allegedly spoke with her through Facebook.

The nine-months-pregnant woman went to the Figueroa's home expecting to gather some baby clothes and other donated items, police said.

Authorities allege Clarisa Figueroa and her daughter Desiree killed Ms Ochoa-Lopez and and extracted the baby.

Within four hours of when Ms Ochoa-Lopez was last spotted driving on a road by surveillance cameras, the elder Figueroa called emergency services claiming she had delivered a baby that was not breathing.

The child has been hospitalised and reportedly is in serious condition. Police declined to confirm the baby's medical status.

Police said their missing person case took a turn when they first learned of the Facebook conversation and interviewed the Figueroas on 7 May.

They obtained a search warrant after DNA evidence proved the baby was related to Ms Ochoa-Lopez.