It happened Wednesday night in Prospect Heights.
A 32-year-old woman was pushing her 2-year-old son in a stroller when police say 27-year-old Matthew Wally grabbed the stroller and demanded the woman give him the baby.
The boy's father ran over and struggled to get the stroller back.
Wally was arrested a short time later.
Police say he was previously accused in a string of thefts at Sephora stores.
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