Is This In "American"?

[ecchi]

Despite my comments in a thread on the "Adult Help Wanted Ads" board, when I write I am aware that the largest percentage of my readers are American, so I try to use "American words" wherever necessary (although "English" spelling). However I don't like doing this (it seems too close to "patronising") so I only do it when I don't think American readers will know the "English" word. Unfortunately, since I do not live in America I don't have a good knowledge of what Americans know. So, if you are American, could you please read the following paragraph from my next book:

Goran was born very early in 2319. Soon after his birth civil war broke out on Dominatrix. But by then he was in the care of male slaves whose job it was to bring up male children and teach the boys to be good slaves. So he saw nothing of the war. And even if he had, he was still less than one year old when it ended, he would have understood nothing of the war, and not even remembered it. So those who say that this war, early in his childhood, shaped his views on life and was instrumental in forming him into the freedom fighter he became, are fools. At the time of the civil war Goran was still learning to crawl, to walk, and to not shit in his nappy. The war passed him by.

Does that work in "American", or do you not know what a "nappy" is (i.e. do I have to change the word to "diaper")?

Thanks.