FIRST POST - AND ON SUCH A DEEP TOPIC! 8D
Regressing is always something I look forward to doing personally, a mixture of a hobby and a lifestyle. I pretty much agree with Jeffy. Being
AB/
DL and/or furry can be a strong coping mechanism for many of us. Something to fall back on and roleplay when stressed or just bored. I can't really act how I wanna act around family, but in private or especially when around other babyfurs or furries in general I'd feel much more comfortable about it. :P
The furry aspect of being a babyfur I tend to see more as an online thing though. Not to say you can't add it to what you do IRL, like having lots of plushies or paw-printed jammies, etc.

But typically I think an average
AB/
TB and a Babyfur meeting IRL would do allot of the same things. Conversely, a babyfur who hangs out with normal furries would switch to a more mature behavior around them.
That said, Babyfurs do seem so much more open about their infantilism then our non-furry cousins. Going to cons is a good example of this. I guess it helps to be able to hide it in a broader fandom though.
... I feel like I'm rambling. >.>