A person within the ages of 13-18 who is an infantilist, also can be expressed using the short form TB. Sometimes also has other characteristics such as furristic tendancies. (eg: babyfur)
See infantilism
Charlie goes to high school and he is a TB.
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A teenager with a baby face. Odds are they act like they are 9. Typically, they are the most annoying fucks on the face of the planet. Acts like a golden retriever. Typically are named Matt.
Oh my god! That Baby Teen is here. My night is ruined!