Antonio Ansara Cooper Jr. was just learning to crawl and say “Da-Da.” The 6-month-old was a happy baby who never cried and loved to laugh, said his father, Antonio Cooper Sr. “He’d make himself laugh by playing with his toys,” the father said. Young Cooper also liked to be thrown up in the air and watch his mother, Renee Cooper, dance. Antonio Cooper Jr. was born Oct. 11, 1994, on his father’s birthday. He had attended America’s Kids day-care center since December.