Oh, that's too bad it's too small - it's so gorgeous! As a mom myself, though, I know what you mean about it being too small. If I were still toting diapers, wipes, etc. around, I'd need something bigger. Luckily my son's 4 now so I only need to have enough room for a water bottle, a snack and the odd toy. The City's perfect for that.
Can you afford to keep the City (in addition to getting a Work)? You'll probably love it once you don't have to carry all the baby stuff around.