Honestly, I went to check on the child and he had pulled a box of candy apples off of the table and was chowing on them. I thought it was cute. I decided to grab my camera and take a few shots focusing on the "thirds" rule; and for the most part his eyes being my focus. A few shots of a certain young lady that I posted recently got bashed for composition amongst other things. I thought that a few of the pictures turned out nicely. I was trying not to disturb the child and follow the "thirds" rule at the same time.
Now that does make a difference. Remember that the 'Rule of thirds' like almost everything in photography is a guidline at best. There are a whole host of "rules" (Golden mean, rule of thirds, etc) which are considered elements of good composition. They don't apply in all cases, and at the end of the day, what looks good is what works.
One of the guiding principles of the rule of thirds as it relates to portraiture is that the subject should be offset from the centre of the image by about 1/3. In #s 3 & 4 you have the child almost centred and in #2, he occupies the left-hand half of the frame.
When you're shooting things like this, you have to work with the hand your dealt; so, rather than try and acheive a perfect composition at the moment, you'll often get better results by opening up the shot ("zooming out") a bit and then cropping to the final composition in post.
As an aside, I'm not sure if I recall the post to which you made reference above or not, but bear in mind that while some people here are blunt in their commentary, C&C does mean comment and critique, and in 99.99% of cases, even if the response is phrased in the most polite manner, it is provided with the intent of helping you.