Trevor Cooper is the baby of the Cooper family in Disney's 2014 live-action film Alexander and the Terrible, Horrible, No Good, Very Bad Day.

Role in the film

Trevor often cried unless he had his special bumblebee pacifier. He was often taken to baby care seminars by his father, Ben, while the other parents were mothers. There, he said his first word: "Fommy", which meant father and mother. When Alexander accidentally dropped the pacifier in the garbage disposal which Ben accidentally turned on, it caused him to cry for hours.

The next day, Trevor was taken to Ben's job interview about video game designing. There, he was seen eating a green highlighter and getting the ink all over his face. Later on, he felt awkward that Celia was riding in the same wrecked van as everyone else to Nagamaki, only to be making noises through his fist.