As a mom of 2 myself I'm going to commit blasphemy and suggest that I would not use any Bal as a diaper bag. They are not compartmentalized or lined the way most diaper bags are, and those features are important for a reason! You will want all of your essentials to be within easy reach without having to rummage and look through every corner of your bag, and if something leaks you don't want to be paranoid about your Bal leather. If you want a designer diaper bag, I know
Gucci and Burberry make them (and canvas is more affordable) BUT you could also treat YOURSELF with a smaller cross body Bal like a town or even giant hip that you could use for your own wallet, keys, sunnies, etc. in addition to your diaper bag! The diaper bag fits across the stroller handlebars and you can be pushing it while rocking your Bal
Just my 2 cents - congrats on your new baby and good luck!!