Police said Jaquirion Dancer was in his mother's arms when the beating began.
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According to WISN-TV, Jaquirion was taken to the hospital but died a few hours later.
"You know, this is her little boy who was born not long ago, a preemie who was fighting and doing well, and for her this is a huge tragedy," said Rev. Dan Quakkelaar, a pastor, who met with the mother to offer comfort and support. "You can tell from the picture that he was a beautiful boy and full of life, and it's hard to deal with when a life like that is lost and so tragically and so unnecessarily."
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Officers said they have a suspect in custody.
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If you or someone you know is a victim of domestic violence, please seek help.
Experts are available online or by calling (800) 799-7233.