i Register
In some senses, babyfur is marked as slang. Watch for register when choosing this word.
noun
A furry character that is a baby or toddler.
A member of the furry subculture with an interest in roleplaying as a baby.
Nothing in the world says you have to accept babyfurs, but simple commonsense demands that, if you don't want to be singled out yourself, then you have to tolerate them, just as you want to be tolerated.
I have never seen a babyfur at a convention wearing diapers openly.