When pregnant and thinking of things I wanted to help my children be someday (loving, inquisitive, healthy, etc.), tall never actually came up on my list. I figured it was pretty much up to genetics, and as long as I didn't do something that knowingly stunts growth, like smoking while pregnant, they'd grow to the height determined by their DNA. Turns out, there was something I could have done to make them taller people.
It's simple and, unfortunately, not something I did (sorry, kids!). But if you're pregnant or thinking about getting pregnant, it's something you may want to consider.