There is a tube in your ear that drains into the back of your throat. If it becomes clogged then fluid is trapped in the ear. It can happen with or without an infection. It's very common in kids. He's got to go to the doctor
Does the discharge have a colour, or is it clear? With the information you've provided, it could be anything from ear wax drainage to a serious infection. If you're feeling any pain or have a fever, see a doctor.
my brother has yellowish/white fluids in his ear..