The 34-year-old suspect - who then took the dead baby to a local hospital, claiming she had had a miscarriage - was due in court a day after the grisly incident in the small Colorado town of Longmont, north of Denver.
The 26-year-old victim was operated on and survived after the attack on Wednesday.
Police released a harrowing 911 emergency call in which the victim begged for help.
"Officers entered the home and located a female who had been beaten and stabbed in the stomach," local police spokesperson Jeff Satur said.
"It was later learned, the female was pregnant and her baby had been removed. The victim was transported to the Longmont United Hospital where she underwent surgery and is expected to recover."
The suspect "was located at the Longmont United Hospital with a deceased baby, reporting a miscarriage. The suspect and victim were not known to each other prior to this incident."
Satur said the suspect was due in court Thursday afternoon, facing a charge of attempted first degree murder.
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