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1.
1. An uncannily small penis on a full grown male

Also see: baby dick; hagerman
Bob: That dude's dick is 3", hard.

Jonny: Yep, he has a baby penis
by Nathaniel Mayweather July 19, 2005
 
2.
An oversized clitoris that resembles the penis of an infant.
Chad: "I was going down on this chick last night and she totally had a baby penis, brah!"

Brad: "Duuuude! Gross!"
by tr2 + br2 August 04, 2008