I mean, you know how women are, right?
Please tell me you're not serious. You know there are a ton of us double X chromosomes on this forum, right? And I'd be willing to bet most of us out-frugal you any day of the week, even those of us who are expecting or already have kiddos. Babies don't magically make our brains turn off, you know? Well, maybe they do make us forget not to put our cell phone in the fridge or our socks on inside out, but that's not quite the same ;)
Apart from that, how can you talk about the woman you're going to marry this way? It's so disrespectful. Would you read your post out loud to her? If not, then I suggest you stop talking about her behind her back in such an insulting way. For one thing, you haven't even started being frugal yet, and you're already criticizing her for not being able to be on board. Maybe she's trying to keep up with your spending. Maybe she'll be the frugal-est lady this side of the Mississippi. You haven't even given her a chance. For another, you're doing the exact same thing you're insulting her for - jumping on a new thing, browsing around, thinking about it, planning, getting your mindset pumped up...
Thing is, you have to be pumped up about the same things in a relationship. Not everything, but the big things. Lifestyle and kids are both Big Things. And if you aren't able to communicate with her on this, baby, you should not even be
thinking about having a kid. Bad communication is the number one deal breaker in a relationship.
The way I see it, having a kid was my big motivator to get my finances together and my expenses down. I wanted to be able to take 5-10 years off and just have kid time. If that's what she wants, then you two need to talk about how you're going to do it. And if that's not what she wants, you should know now, before the $5000 bill for Gucci infantwear comes in the mail. Communicate. Get excited together about being financially responsible for your future kid. If that's not a good motivation, I don't know what is.