It's a fair question. You're probably going to get a lot of different takes on this. My mentality has always been that there is a time and a place for everything, there is even a time and a place for being little outside of the privacy of your home like say at an Amusement park or in a toy store. Now this doesn't mean you should go around wearing a diaper and sucking your thumb everywhere, but you can be more childlike in some spaces as opposed to others.
When I enter the classroom or go to work, my brain becomes like a series of switches and I can shut off my AB side and impulses until it's appropriate to switch them back on again. I wouldn't be surprised if a lot of AB's are the same way. It's all about compartmentalizing, knowing when it's a good time to be a baby and when it isn't. If you are afraid that keeping your little side under-wraps even at work or in a public place is antithetical to your self-acceptance as an AB or to who you are as an individual, then you can always do what I do and carry a small baby item with you at all times. For instance, when I'm really stressed out and want to regress, but I am called off to work or to an impromptu school meeting, I'll bring a pacifier with me in my pocket or a teddy bear with me in my backpack, sometimes that is enough to remind me that I'm a baby, in fact, sometimes it's also a great motivator, it reminds me of what I have ahead of me when I finish my work and finish it well.
So, in answer to your question, I'd assume most of us just shut it off in order to resist the urge, it's never a permanent thing, it's just you gotta know when it's right to be little and when it isn't, all good things in moderation. If it's difficult to shut off and sometimes it can be, have a small babyish trinket on you, that might calm you down, put things in perspective and get you motivated. I hope this helps