1) Ignore everything about deleting photos. Your time is more valuable than drive space. A 3TB of memory is $140 at Best Buy and the price is dropping. Every minute you spend deleting images is a minute that could be spent either editing a picture or better yet, enjoying your son.
I am going to single this point out for disagreement as if it were general advice.
In some situations (wildlife - birds or macro scenes are a good example, I've even found handheld landscapes and flowers to fall into this category often) I find - and other people shooting in better light or at more reasonable shutter speeds often will, as well - that if you want the best picture it often pays to take more than one. I've only seen sports photographers claim that they can find the image at the exact right time, but their cameras (well over 7 frames per second) and many of their colleagues tell a different story. Those extra frames are there to help you out.
By all means, I encourage keeping images if you aren't sure if one is good or bad - coming back to a set of potential winners later on will give you an idea on what works and what doesn't. Pruning these image sets might just save Junior some time down the line (a bit like inheriting boxes of uncategorized 35mm prints on your kids, people talk about "digital hygiene" nowadays) but it also forces you to make some decisions about what works artistically, and what doesn't. It goes beyond emotionally parting with a subpar image.
I would emphasize that it takes relatively little time to prune an image collection, since you already will be looking through your images at some time later. When I look through images in Irfanview, it is literally less than two seconds to delete an image and load the next one - which maybe sounds like a long time, but I already have to wait nearly a second to load the next image without deletion. Deleting a RAW image is two additional keystrokes (a couple more at the end of the session to clear out the recycle bin, if wanted). It's not a big deal and I would argue it's a good habit.
If somebody isn't finding images to prune, that means you are most likely not taking a lot of images, missing opportunities, and probably not too serious about improving your skills as an artist and photographer. This is fine, and I wouldn't put somebody down for it, if they make a conscious decision not to let photography command their life, but I think we can promote something a little more aspirational here (and again, once you learn this stuff it is really very quick). It shouldn't be tagged as being a daunting challenge to prune your images.
What's superfluous is all that stuff about opening the RAW and tweaking it - if you don't have a good exposure to start with, you can't save it (unless you're a hardcore photoshop abuser / airbrusher)! I used to have a lot of familiarity with Photoshop (version 5-6, circa 1998-2000) but now (despite having a raft of image editing programs) I mostly swear off it and focus on getting it right at the scene.
2) Ignore everything about additional programs. Do you really want to take the time to learn some new program so you can spend even more time editing pictures? Learn to use the program you already have and when you outgrow it and feel a strong need for something else, then move on, but don't go out and buy some new program based on what someone on this forum gets off on.
It would be Nice, for sure, not to have to worry about software changes. But these days you are a technological luddite at your own risk. The downside to not having your RAWs saved in a more long-lived format is that you won't be able to read them back years from now - we're all planning on living at least another decade, right? - and while it's nothing like the risk posed by not paying attention to computer security, not logging into your bank account from a public computer, etc., it goes with being an informed, modern citizen. Just like "ignorance of the law is no excuse," sheltering yourself from the real changes that are happening in photography means that you might end up with nothing to show from years ago.
7) Finally, don't waste your time on this forum. That's time you could be spending either editing pictures or playing with your kid. (This one falls into the do-as-I-say-not-as-I-do category). 
You don't *have* to believe in the infamous, mythical Bit-Rot, but those hard drives most assuredly are prone to the same effects of time that even the Bible warned us about. And even if the hard drive survives, do you think that Circa 2011 computer hardware will be as plentiful in the future as today? Maybe, maybe not. I have tons of 5.25" floppies about but still haven't hooked up a drive to my computer. Most of them I probably don't have a chance of using (on modern computers) in any meaningful way.
Other than those points, I would say that your overall message - just stop worrying and take pictures - is pointing in the right way.
