It happened on May 12 on the 3700 block of Germantown Avenue.
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Police say the 32-year-old father and another man exchanged words before he was shot four times in the leg.
Video released by police shows the gunman opening fire in front of the infant.
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The father was taken to an area hospital and listed in critical condition.
Anyone with information on the suspect is asked to call police at 215-686-TIPS.