2 conditions can result in "fluid" draining from a baby's ear
(s): the first is an infection in the ear canal ("otitis externa
"); the second is an infection behind the ear drum ("otitis media
") that has come through the ear drum and is draining.
Some baby's simply accumulate some small amount of bath water in ear canal. If the fluid is not clear, or if the fluid smells bad, get to your doctor.