A 4-month-old boy became sick at a Bronx day care center Thursday night and died at a hospital shortly after, cops said.

Moments after little Cameron Willingham was fed about 5:30 p.m., workers at Lil Stars Daycare in Throgs Neck noticed him in discomfort and vomiting, police sources said.

They called 911, and by the time paramedics arrived to the Prentiss Avenue center, the infant was unconscious and not responsive.

Emergency workers tried to revive the boy en route to Jacobi Medical Center, but he didn’t make it.

Police said his body showed no signs of trauma. The city Medical Examiner’s Office will make an official ruling on his death.