This happened to me with a denim quilt (made with squares) -- when washed the first time several of the seams unraveled. Because it was made with a fleece backing and done envelope style and then tied, I used strips of denim to overlay each seam that raveled. It worked and I keep several strips made up for each time I wash it (which isn't all that often) in case other seams unravel. The reason for my problem was scanty seams ------ will never do that again! Once burned - twice shy (as my Mama would say).