UPDATED: 4:20 p.m.
Francisco Ortiz, 29, is expected to be charged with attempted murder and related offenses.
The baby, Yazeem Jenkins, is still in critical condition. He was shot four times while in the back seat of his stepmother's car, around 8 p.m. Saturday, on the 4000 block of North Seventh Street. He was hit in the back of the head, in the chest, and twice in the backside.
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If he survives, he will likely be paralyzed.
Ortiz has several prior arrests involving gun-related offenses, according to court documents. He was taken into custody Thursday morning but he has not been formally charged.
Philadelphia police believe there may have been a second shooter involved.
One day after this shooting, another took place in Kensington, which took the life of 2-year-old Nikolette Rivera. Police took two men into custody. One man has been charged, and the other, who has not yet been formally charged, confessed to firing the shots.