It's sexy time one night in the Simpson house. But Homer forgets protection, and in a few weeks we find out that marge is pregnant. This is an unwanted and unexpected pregnancy but they accept it. Over the next few months, the baby grows, and then one day, the due date comes and Marge heads to the hospital. Marge has a tough delivery and shortly after we know why. It makes the news, "Unusually large, ugly baby born." Ugly indeed. Also it's a giant.