This all unfolded just before 9:40 p.m. in the 3800-block of North Richmond Avenue, according to CPD.
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Video from the scene earlier Wednesday morning shows police officers investigating the scene.
Police said the suspect was a "known male," and demanded that a 17-year-old girl place that baby girl in a car seat.
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CPD said that's when the male suspect struck that 17-year-old on the head before taking the baby.
Despite being hit, police said the 17-year-old refused EMS treatment on the scene.
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CPD said the incident is domestic-related.
It was not immediately clear how the 17-year-old is related to the male suspect, if he's armed and if he's related to the baby.
CPD said the child was returned to the location where the incident originally took place just after 6 a.m. and was found by a neighbor.
The baby appears to be unharmed, but was taken to Swedish Hospital as a precaution, Chicago police said.
Area Five detectives are investigating.