India, Jan. 26 -- London (dpa) - "You'll get used to it in no time." So goes the reassurance given by many a grandparent to a son or daughter wincing at the prospect of that first nappy-change of a newborn. The likelihood is that granny and grandad not only have a strong stomach, but, following years of parenting, have become "inoculated" against the retch-inducing, hold-your-nose aversion that excrement and bodily fluids can prompt in less-experienced guts. Researchers have found that parents - particularly those of experience with at least some children whose nappy days are in the past - are far less likely to get the ick from images of excrement than others. "Repeated, long-term exposure to bodily waste significantly reduces parents' dis...