Baby bloomers

I made these from the pattern in Amy Butler's book Little Stitches For Little Ones. They are so cute, but that's really not the point, since they don't fit AT ALL. (This is a great picture because you can't tell.) Ray cracked up laughing when he saw them and asked if they're baby low-riders. What did I do wrong?? I can't imagine that there's something wrong with the pattern, so I need to figure out what's wrong with me.