My best friend is going to have a baby in a couple of weeks and is unwed. However, she and the father plan on getting married in a year or two. In the meantime, everyone says it would be easier to give the baby her last name and change it when they get married. However, his parents argue that it will be very difficult to change it later on. Is it difficult and expensive in Illinois to change the baby's name when they get married? Which would be easier and cheaper? If it matters, she is in Headstart, Wick, and other programs to help mothers.