Officials said Debardelaben helped the victim get a baby stroller into an apartment building Friday afternoon near the University of Chicago campus. Once inside the vestibule, he robbed and tried to sexually assault her, police said.
A building resident heard what was happening and called for help. The baby was not hurt.
Police caught the suspect a couple blocks away trying to climb a fence.
Debardelaben, of the 7700 block of South Drexel Avenue, is charged with one count of armed robbery and one count of attempted aggravated criminal sexual abuse.