Organic Baby Clothes: Why Are So Many Parents Sold on Organic Baby Clothes? Here's an overview of what I found out: Formaldehyde is a common fabric finish. 7 of the top 15 pesticides used on conventionally grown cotton crops are potential or known carcinogens. Over a third of a pound of pesticides are used to produce the average cotton t-shirt. Repeated washing does not guarantee that these chemicals will go away.