I think the point the previous poster was trying to make is that people have wildly different personalities, and that any observation with a sample size of 2 is

I think the point the previous poster was trying to make is that people have wildly different personalities, and that any observation with a sample size of 2 is basically useless to draw any conclusions from. I'll also add that different people respond very different to things; maybe for some babies sleep training might have long-term effects, and for some it doesn't. Certainly if I look at my own shitty childhood, me and my brother responded quite differently. He was affected much less than I was.