A baby bat is a person who has discovered Goth, but is unfamiliar with the scene. They often listen to Goth music, and have distinctive 'Goth' tastes (an interest in the occult, macabre acadaemia, a love for the Victorian/Georgian societies) but haven't yet become acclimatised to being non-mainstream.
Baby bats are distinctive from emos in both personality and dress sense. Though the bats often use heavy make-up, they wear more tartan and netting/tulle than emos and are more stereotypically Goth. It takes a keen eye to distinguish some emos from baby bats, but there is one difference:
Baby bats grow up into Goths. Emos grow out of the fad, and into accountants.
a) "Check that emo!" "That's not an emo, that's a baby-bat." "How can you tell?" "She's got a Bauhaus patch. No emo listens to Bauhaus."