When I make quilts for children, when I quilt, I use a stitch that looks like a double sided blanket stitch and stitch in the ditch on every seam. I know these quilts will be thrown in a regular washing machine often.
My dear Step Mother made my oldest boy a small nap quilt when he was born. It got washed a lot and every time I had to repair the seams before letting him have it back. Thats why I do this style of quilting on kids quilts.